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I just got done with a custom build, it worked just fine for 3 days, then today I went to turn it on and the CPU fan comes on along with the power supply fan. Nothing boots up, and the DVD Drives won't even open up. I have tried booting without anything extra plugged into the motherboard. I can't tell if it is a motherboard problem or a power supply. I exchanged the motherboard and have the same problem. Any suggestions?

Why would you change out the board instead of the PSU?
What brand is it? How many watts? How many amps on the +12v rail?

I switched out the board, at the direction of a guy I know that owns a computer repair place. I told him I didn't think that was the problem, but here I am.
The PSU is 420 watt, 14A on the +12v1 and +12v2 rails. The brand is Turbolink.
Thanks

if the dvd drive drawer wont open then i would think it was more likely to be a power supply fault, the power supply puts out different voltages and it is possible that one of those voltage outputs has failed

From a review of your PSU:
"The TurboLink 420’s specifications struck us as incredibly poor"
http://www.anandtech.com/showdoc.as...
Plan on spending at least $40-50 for something decent. I just had a quick look at newegg & here's a couple of low cost possibilities:
http://www.newegg.com/Product/Produ...
http://www.newegg.com/Product/Produ...
Here's another:
http://shop4.outpost.com/product/51...
http://www.ultraproducts.com/produc...

The power supply is good, i just got it tested, I tried another PSU in the computer and same think, it comes up with a FF error with every PSU. IS that a Processor error??

How did you test it? Was it actually load tested? Were actual voltage readings taken from each rail? or was it checked with one of those cheap plug-in testers with LEDS (green = good, red = bad)?
You didn't mention anything about an "FF error" in your earlier responses & you also haven't listed the specs to your machine.
The FF code apparently means different things depending on the make of the motherboard, but "FF = Fully Functional" seems to be a common theme. If you have an ABIT board, "FF = Normal Operation"...here's the code list:

I just had it tested this morning, and the guy has hardware that plugs into the PCI slot, and it came up with a FF error. AMD is taking a look at the processor, and biostar is going to look at the motherboard, I'll let you know how it turns out.

"I just had it tested this morning...."
Power supply load testers cost many thousands of dollars. This site puts the price at about $10,000.
"Unfortunately we do not have a load tester to pull the labeled power from these power supplies, so we cannot say if they can really deliver their labeled power or not (an equipment like this costs around USD 10,000 in the US and we hope to buy one someday)"
I'm guessing the shop you're dealing with doesn't have one & probably didn't even use a voltmeter. Here's what one looks like:
http://www.tomshardware.com/2005/07...
"....and the guy has hardware that plugs into the PCI slot, and it came up with a FF error"
Post codes can be found at the following site. Just pick your BIOS type from the left column, then find FF on the code list:

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