PC won't boot - but mobo has power

August 16, 2011 at 15:29:12
Specs: Windows Vista 64x, DDR3 4 GB 1333 MhZ and an AMD Phenom II 955
Hey There,

I recently replaced a few parts in my PC, and I'm trying to get it back up. I recently installed a new motherboard and some new RAM, and I'm finding my PC won't turn on. Here's some of what I am using:

-750 Watt Power Supply
-DDR3 4 GB 1333 MHz RAM
-AMD Phenom II 955 Quad Core processor
-ASUS M4A88TD-M motherboard

I also have a video card that I haven't even tried to use yet. This is getting highly frustrating - I've confirmed the mobo isn't touching the case at all and is seated properly, and is recieving power.


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August 16, 2011 at 15:41:39
"750 Watt Power Supply"

No make, model, or amperage specs?

What about the CPU heatsink? Did you get a new one or re-use the old? Did you thoroughly clean both mating surfaces & apply a tiny dab of thermal paste?

Also, you will most likely have to reinstall Vista due to the hardware change, so don't be surprised if the system won't boot into Windows. And out of curiousity, what did you upgrade from?

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August 16, 2011 at 16:35:37
More specifically, my power supply is a Corsair CMPSU 750 TX, about 3 years old, and has never shown any problems. I'm using a brand new fan and CPU heatsink, and yes, I've applied thermal paste. And I'm not sure at all what you mean by "upgrade". My old processor was an AMD Phenom X4 9750, and my old motherboard was an Asus M4A785-M, if that's what you meant.

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