Bad MB or PSU? - Screen goes blank while PC keeps running.

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vim0314

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Dec 2, 2012
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I built a HTPC back in April 2010, used it for couple years as a HTPC and a daily PC without any problems. Then gave the PC to my mom as a daily use computer, but I'm having some problems with it and seeing if anyone could help me out.

I power up the computer and before it gets to windows it just shuts off on it's own. I am thinking it might be a bad MB since it'll still shut off even in BIOs screen. Shutoff as in screen goes blank/flickers a little while PC keeps running. Computer will only run for 2-3 mins then screen goes blank. I've tried moving the mem sticks already and that didn't change anything.

I think it's either the MB has gone bad or the power supply isn't strong enough to power up the PC anymore. Any recommendations on what to try next or what I should try replacing first? keep in mind this is just a budget PC for youtube, news, email, etc.

I have already read thru the PERFORM THESE STEPS before posting about POST/boot/no video problems! thread.

The specs are: (built back in April 2010)
MSI S785GT-E45 AM2+
Athlon II X4 630
Patriot 4096MB PC6400 DDR2 800MHz Desktop Memory
420 Watt Power Supply (APEVIA ATX-AS420W)
Seagate Barracuda 7200.11 1.5TB HD
and some HP DVD drive.
 
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I have already tried with just one mem stick. I don't have a pci-e vid card to test with nor a spare psu....
tried pulling the CMOS battery then replacing it but still same problem.
disconnected HDD and DVD from power supply and booted into bios, but after a min screen went blank. If the PSU is bad wouldn't it just shut down if it was being over loaded? - like completely turn off?
My monitor still detects a signal because if I was to pull the DVI cable then the monitor will display "NO SIGNAL".
 
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ok guess I'll go out and buy a PSU to check if it's the PSU. any recommendations on budget power supplies for the components I'm running?

Sorry I could have explained better on the no signal. When I start the computer and the screen goes blank, my monitor is still detecting a signal - because when I hold the power button on the computer and power it down, then that's when the monitor displays "no signal"
 
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bring the psu to a local shop see if they could test it and if psu is dead you could buy one from them if the price is fair and a good quality one get something around 600 to 650 watts with a pci-e cable connector so later if you had a pci-e card you will be able to power her
 
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I have a frys and microcenter close by so I'll probably go to one of those stores to find a power supply. Do either of these stores offer testing of PSUs?

For some weird reason, I got the computer to load up to windows and it's been up for about 10 mins. (Have not been able to do this at all previously.)
 
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I have the case off right now and it's not dusty in there. A little bit of dust that I have already cleaned off...
Unfortunately the screen went blank before I could get the temp software installed.
 
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so this time when I tried to boot up the computer, screen is always blank. Nothing shows up on the monitor, not even the MB BIOs start up part... what could I try now?
 
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Sorry I haven't replied here in a while... Replaced PSU and that didn't work so I'm pretty sure the problem is the MB. Unfortunately I can't seem to find any MB's that support AM3 with DDR2, so that would require for me to upgrade the MB and mem...
I figured I rather look for a deal on a laptop and give my mom a laptop rather than buying more components for this PC.
 
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