No signal on monitor one long beep 2 short beeps cant get into bios

[PhantaSee]

Just like the title says i recently got a new power supply and everything starts up fine except for this beeping and when it isnt beeping nothing shows up on the monitor anyway. I also tried everything on the No post/boot checklist thing. the motherboard i have is an asus M5A78L-MLX Plus. I've tried reseating the ram reseating the cpu tried the onboard video and two different graphics cards. I know the graphics cards are good because they work in another machine in my house.
What am i not doing here?

 

[lowriderflow]

not to insult you... but I've seen people before forget to plug in both powers to the motherboard. the main MOBO power, and also the 4pin CPU power at the top next to the CPU

 

[PhantaSee]

i made sure that both of those are in.

 

[Saga Lout]

Please don't use Bump in Tom's - it's against the Rules of Conduct outside the Deals sub-Forum and wholly inappropriate when your thread is only a little over an hour old.

 

[Saga Lout]

It might be worth taking out one RAM out and see if it happens with the other(s) in then repeat the experiment with each stick, putting an original back until you find out which has the problem.

If the motherboard has onboard graphics, connect to that and remove the graphics adapter. Another point - has that graphics card need its own power supply?

 

[PhantaSee]

ill try doing that. and thanks for letting me know bumping isnt allowed.

 

[PhantaSee]

still nothing and i have no idea if the card needs its own power supply.

 

[Saga Lout]

That board does have onboard graphics so try it without the add-on card. There's also a BIOS update for it which might help you.

 

[PhantaSee]

how do i update it if i cant get into the bios?

 

[Saga Lout]

You might be able to if you can get past the beep and that's a process of elimination of RAM and graphics - whichever is causing it.

Also, check all the connections for the front panel switches.

 

[PhantaSee]

i still cant figure out whats the problem the ram or the graphics card. im leaning towards the ram but it works in another machine i have.

 

[PhantaSee]

So i got it to stop beeping but there is still no video. To make it stop beeping i reseated the cpu and it stopped beeping.
also another thing when it isnt beeping i cant turn it off with the power button in the front of the case i have to actually turn off the power supply from the switch on the back.

 

[PhantaSee]

ok now its back to beeping and still no video.

 

[PhantaSee]

i still have the beeping even with the ram installed.

 

[Saga Lout]

It rather sounds like the entire board is at fault - than again, it may ve the case so take the board out and put it on a flat surface - not metal, of course.

Strip everything off it except the CPU and heatsink and start again with nothing but power and one RAM stick. Connect both connections if there are two. Use a small screwdriver to short the power pins and if it doesn't beep, short them again until it powers down. Add in another RAM stick and repeat the process. Next, if no beeps, plug the monitor to the onboard graphics port. Keep adding things and noting the results.

It's a nuisance having to do it but it saves buying testing gear you may never need again. If you don't finally find what causes it, put it back in the case - that might point something out.

 

[cdroms]

Believe it or not. The answer might be so simple. I had the same problem. I found out by chance. All I had was a dead battery on the motherboard. I put a new battery in and it worked. A simple bios battery. You've tried everything else. So give it a go.

 

[Saga Lout]

Thanks for your input, cdroms, but this thread died the death in January, 2014!!!

I'll close it now.