rub3n213 :
Ok so maybe the new card might of overloaded the PSU or something, only one way to find out, new PSU yay... haha. Would you recommend any? I'm after one thats good with value and has about 600w or maybe even 550, but the ones you linked up there were out of stock, actually can you explain what a modular psu is? if it is, isnt or semi, i dont get what modular has to do with a psu?
I'm thinking of this,
http://www.cplonline.com.au/enermax-triathlor-eco-650w-80-bronze-modular-psu-etl650awt-m.html
Sorry guess I was posting my last one while you were doing your step by step post. Forgot about the language barrier here while writing a foreign speaker books in english but translate from google if you must
Looking at it your post I missed before this one, by clearing CMOS I mean remove battery but ALSO need to short the jumper for about 10secs to actually get the job done.
http://support.asus.com/download.aspx?SLanguage=en&m=P5Q+PRO&os=29
Pick your language for the manual if you don't have your original. Page 46 of 180 in english one (section 2.6, or page 2-20 jumper section) for how to CLEAR RTC RAM. There is a jumper on the board labeled CLRTC. You remove the battery (of course unplugged pc power cord on back of unit first), then move the jumper from pins 1-2 (default) to 2-3 for 10 secs with battery out and pc unplugged. Then move back to 1-2 pins and put battery back, plug PC power back in and boot. You may have done that already, but it wasn't in the post so not sure. The manuals always say do the pins, if that doesn't work do the battery+pins but I say why bother with the pins only just get it done right the first time
Moving on here - thanks for the steps by the way, that always helps a tech catch the little things especially if you get every detail in there if it's possible to remember it all...LOL (like shorting the pins above if you missed it). So since beeps died with new card it could be PSU (I'll get to that OUT OF STOCK shortly still reading each word in your post). Fan issue shouldn't have shorted anything but stranger crap has happened. CPU would not die due to this, it isn't even hot on boot and not working at load like in a game or something. It's not like you are waiting for days for the screen to show data with it ticking. You got right on it and fixed it.
NO BEEP though to me = NO POST success (Power On Self Test that all pc's run through at boot before moving on to booting your OS, drivers etc). That is either a CLRTC you can clear in some cases (as noted with battery+jumper above) if some setting etc messing it up and hangs it, or something is really bad here causing POST to fail. PSU, Vid, cpu, mem usually would cause it and in some cases (mem/vid) you get many more beeps (beep codes, different depending on who makes your bios in some cases, phoenix, award etc). But we're getting NOTHING here. I lean toward bad PSU in YOUR case since I doubt the cpu just up and died for really no technical reason here and mem isn't an issue probably and you likely have a good OLD card so not vid now I'd think (logically speaking IMHO). So again back to PSU if I was a betting man with no other way to test the cards in another pc etc.
IE, I have no way to test what is the best guess. PSU I think.
Electrocuting people...LOL.

Sorry didn't mean to confuse and get too technical. If your RAIL is lower than Nvidia recommendation of 24amp (which your rails for 12v are 17a & 19a if I am correct about model# and pic I found that wasn't fuzzy) you may have issues. Thus I like a HIGH amp SINGLE rail. If this makes more sense. But doesn't matter if not, I can pick a proper one easily.
On the last sentence in that post, CMOS is just a way of saying clear the bios (battery+jumper) as noted before. It stands for Complementary metal–oxide–semiconductor but in this case just a high tech way of saying "that crap that holds the date, time, and system parameters so you can boot your PC".
On to the Out of stock. Sorry you must mean at your shop? Newegg has them in stock, but I'm guessing you can't buy from there or amazon then? Or just better to buy locally so lets look at your store you picked since you probably know what is best for your country for price etc.
One more detail first: Modular PSU= a PSU where you plug in the plugs you NEED only, and don't have a whole mess of lines you don't need. Like this:
http://www.pcstats.com/articleview.cfm?articleID=2035
Check out that review with great pics. You can see the other side of the psu where they plug in and great pics of all the cables. How they look where they plug in differs from PSU to PSU but the idea is the same, IE - cables you can remove. Having said that I personally will deal with cables and take the time to route them and cleanly tie them down. I feel like the OLD PC Power & Cooling company used to preach - more breaks in the cable=more chance for less perf (impedance etc). Unless it gives me something awesome, I usually vote PERF and FUNCTION over stupid looks that hurt you in ANY way shape or form. I rarely vote for LOOKS and only if it's just extra cash but SAME functionality/perf. You screw with my perf/function I say screw you and your parts
😉
Checking your link/psu pick:
Good specs but dual 12v rails of 30amps each (or is it 25 each? not sure see below). Not a loser, I just like ONE HUGE rail for simplicity for the user as you don't have to figure out how to split your devices over the multiple rails. WINNER based on specs for your 24amp needs but I'd go single rail. NOT a mistake and enermax makes some good stuff, but google of it for reviews "Enermax TRIATHLOR ECO 650W review" without quotes of course and checking for major site reviews I see hardocp (good), johnnyguru (good) etc. So what do they say about it: reading now...LOL
http://www.jonnyguru.com/modules.php?name=NDReviews&file=print&reid=338
http://www.hardocp.com/article/2013/04/23/enermax_triathlor_650w_power_supply_review/#.U5svH-LzKE4
Odd, your link acts like it's 50amp on 12v and no mention of TWO rails split like hardocp showing 30a each 12v1 and 12v2. Hmmm....Confused by this
🙁 Worse Jonnyguru shows the 30a is only for 700w unit, so again confused by label on hardocp pic which shows 700w specs but a 650 picture with those in the pic on the label. What the heck? Also jonny shows 700/650 same 30, but in another line says 54a total for both 12v on 650 and 700 has 58a total here. All acceptable numbers just silly labeling issues or sending different spec'd parts to different sites?
"These are passing numbers overall so that is good but when we look at other recent ~650W units we see that this unit is pulling up the rear behind the XFX ProSeries 650W, Seasonic X-660, XFX Core Edition 650W, and the Seasonic PLATINUM-660 (true some of those units aren't truly in the same class as this unit, but some are and we have few units to compare to)."
"All in all, that means we are still looking at one of the weakest offerings in the ~650W realm we have seen recently so far with this unit today."
OUCH.
" In the end, the unit survives but I am not sure that I feel the results are as good as they look on paper."
"The Transient Load Tests results for the Enermax Triathlor 650W are passing, but as with a number of other results today somewhat disappointing."
"The Enermax Triathlor 650W is a passing unit, but that is really about the best thing I can come up with overall."
They note the noise because of construction also. I think we're done, I don't need to go into both reviews. I'd move along if other options exist personally, but not terrible and your choices might be limited if only having this place to purchase from. Also they label which rail for each line for 12v etc. So better than most that I hate with multiple rails as you can easily put the vid card alone if desired on one rail and everything else on the others. Don't get me wrong this is OK if you must have $85 and only have this store to buy from (but pricey compared to other newegg it seems by a long ways! on everything psu related). Amazon has global shipping also. Are you in Australia or just buying there? Looking at pricing on your site though it is a decent deal. Again hardocp didn't say it's crap just there are better choices. It's a clear JUMP above your old one for 12v which is the new style so to speak (HIGHER 12v now required, new style).
http://www.cplonline.com.au/corsair-cx-600-v3-atx-power-supply-80-plus-bronze.html
the NON modular (better IMHO, but messy cabling, I don't buy modular, I'll deal with cables) is $95 so only 10 more. Also shows in stock like the modular one for both locations for local pickup and for shipping. 600+ reviews on newegg and that is a lot for a PSU it's a dup of the other corsair just without REMOVABLE cables (NOT modular).
"Newegg.com ships internationally to the United Kingdom and Australia. Just select your country in the dropdown menu at the top of our site."
Maybe you weren't aware of newegg shipping to Aus? That's from their faq page and pricing can't be beat unless shipping is absolutely ridiculous
http://www.cplonline.com.au/corsair-cx-600-modular-80-bronze-power-supply.html
Not in stock? Shows in stock in melbourne, notting hill and for shipment I guess. But at $105 maybe you want to stay in the $85 range? Is it not possible to buy from newegg at $45 for the same model after rebate from wherever you are? Is shipping to your location over $50? Tax outrageous or something? Here newegg charges me no tax though amazon does because they have a warehouse down the road in my state. Sorry I have no idea on this stuff being in USA. Single rail 46a guru3d recommended. Amazon appears higher on psu's pretty much so newegg if you can!
Rather than going through a bunch of models what is your price range? Is $85 tops and let me know if newegg is an option and tell me tax/shipping info so we have a comparison to your cpl shop. Is it evil after adding tax+shipping or is there zero tax from newegg for you? I don't want to pick more until we have that narrowed down really. Having said that what you had isn't a loser, I just know from the reviews there is better for similar costs. Being able to see clearly marked on the PSU which parts are on which rails I can accept it if you just want it over with
😉 But I'm showing in stock for the corsair even at cpl so not sure maybe you just clicked the wrong one or you're not getting it from the two shops they say are in stock locally and called some OTHER store they have closer to you and they didn't have it in stock?
HELP me understand what is going on and if newegg is an option etc

Sorry for more questions. Thanks for causing me to read some recent PSU reviews though. OCZ now going down and PC Power & Cooling basically dead now since Seasonic no longer makes them since OCZ took over really, but instead Superflower stuff I'm not impressed with so far. WOW, didn't realize they went totally in the crapper in the last few years. No more recommending tried and true PCP&C
🙁 Bummer. Checked out most of the rest of the PSU list at your CPL store, not many others I'd like under $109. I really hope you just didn't know Newegg ships to AU

MAJOR selection over there for great pricing. It's a book but hopefully not confusing and I think I hit everything you'd need to know

Because of reading for a while this post took a bit of time (open for a few hours), so sorry if you posted something else I haven read yet.