Solved Power Supply Replaced

Msi (motherboard) / G31m3
July 17, 2011 at 18:30:34
Specs: Windows 7, Intel Core Duo2 Processor E4700 2.6 ghz, 2mb L2 Cache, 800 Mhz FSB/ 2 GB DDR2
I have read and went through the problem resolution steps in the Black Screen Check List. I discovered that my Antec 650 W Trio PSU wasn't generating enough power and finally died altogether when I connected two DVD RW players. I just installed a new PSU, Corsair Enthusiast 750TX. I plugged in everything and plugged in the PSU and flipped the on switch, I then pressed the on button and nothing happened. The PSU wasn't tested before I bought it. Should I buy a tester to make sure the PSU isn't the problem. Or should I just replace the motherboard?

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July 17, 2011 at 19:06:46
✔ Best Answer
Post back a link to the 'black screen check list' so we can see what it says.

Can we assume your PC was working OK until you added the two optical drives?

If so, I think it's more likely something happened while you were inside the case but post back some details on what it was doing before you added the drives, after you added the drives and after you installed the new power supply.

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July 18, 2011 at 07:17:26
Thank you for taking the time to repsond to my question.

Here is the link for the list

The PC worked fine until I installed a security update from Microsoft.

I did not add hardware or another application, but after a security update from Microsoft, the Blue Screen appeared. Restarted in Safe mode, tried to restore, restore failed. Black screen, No Post. I went through the list of trouble shooting steps and discovered my power supply was dying. When the black screen issue started the CPU fan, hard drive, and GeForcce 8800 XLR8 512 mb video card fans were working but the LED Power Switch and LED HDD lights were off. The 2 DVD RWs, and wireless mouse and keyboards usb connections flashed on for a second and then died. The CPU fan, video card fan, sysfan1 and PSU fan worked. One sysfan 2 fan didn't power on. The Power Switch wouldn't turn off the power and I had to use the PSU switch. Then it quit completely. When I disconnected everything and added back one optical drive, the PSU only ran for the initial start up but no power when I pressed the eject button. When I added the other optical drive it did the same thing, I had to jump the PSU to get it to work but there wasn’t enough power to keep the fan running.

I bought the Corsair PSU and installed it, connected everything but it wouldn't power up. I then disconnected everything, jumped the PSU and added one optical drive and it ran fine, open and rejected, and then added the other optical drive and that worked fine. When I connected the ATX 24 pin connector by itself, no power.

That left me wondering if it is my motherboard or processor. Hope this information helped,

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July 18, 2011 at 13:43:19
The Tom's Hardware link is pretty detailed. I hadn't come across it before. I'll have to keep track of it. (You left a trailing period in your link so so it gives a page error.)

The way you describe the symptoms it sounds like the motherboard is bad, but I can't say for sure. Often when a power supply fails it ruins the motherboard as well so you end up replacing both. The processor is probably OK

I assume the timing of the security update failure was coincidental since I can't see any way it could be causing any of the problems.

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July 18, 2011 at 20:12:54
The Blue screen appeared during the update's restart and then the problems started. I pulled the hard drive and installed it on another PC and it booted fine, The power supply was dying but I pulled it before it went out. The systems and CPU fans and the video card fan worked, so the PSU shouldn't have overheated.

When I removed the mother board I noticed there were two screw posts missing. One close to he ATX plug and one on the same side by the Power Switch/LED and HDD LED. The ATX connection was partially working because the system fans worked. Maybe a short occurred when I was working on it? I will replace the motherboard. Oh darn, I guess I will have to build a new system. Then I will replace my old HP desktop and build another system compatible with core2 duo and DDR2 Memory sticks.

Thank you! I really appreciate your assistance.

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July 18, 2011 at 21:26:03
You're welcome. The missing posts may or may not have been a factor. If there was any 'give' with the motherboard then something may have shorted.

I hope it works out with the new motherboard.

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