Need Help, New PC Build.

[Elendil14555]

Hello. This was my first time building a PC and i followed a couple guides on how to do it. Its all built now, when i start it up, its on for a few seconds, then just shuts down. Do it again and does the same thing. Plz Help

[maddad ®]

Hi Elendil14555

Tell us a bit more about your machine spec , The more info you give about what you have will make it better for others to help .

maddad

[Elendil14555]

the specs are:
eVGA 256-P2-N516 Geforce 7800GT 256MB GDDR3 PCI Express x16 Video Card
CORSAIR ValueSelect 1GB (2 x 512MB)
SONY Black IDE CD-ROM Drive- OEM
Western Digital Raptor WD740GD 74GB 10,000 RPM Serial ATA150 Hard Drive - OEM
AMD Athlon 64 3200+ Venice 1GHz FSB Socket 939 Processor Model
COOLMAX CW-650T EPS12V 650W Aluminum ATX v2.01 APFC Power Supply w/ "SLI"
ASUS A8N-SLI Deluxe Motherboard
Thermaltake XASER, Armor Series VA8000BWS Black Aluminum/Steel ATX Full Tower Computer Case

[Elendil14555]

(rest of the items are Retail unless said)

[Elendil14555]

After a few tests, i plugged everything in w/o the ATX12V power connecter (i think its for the CPU), works fine, then i turn it back off, now when i plug that in at last, its on for a few seconds then shuts down.

[glc]

http://forum.pcmech.com/showthread.php?t=132409

[Elendil14555]

i dont understand why i would have to do that, its just the ATX12V connecter.
Edit: Could someone check for me if all this is compatible? lol. I believe it is, i checked. And would a 650W PSU make a difference if i didnt use all of it? Like if its to much

[glc]

SOMETHING is causing it, and you have to strip it down to bare essentials to rule things out. If it does it with it on the bench in minimums, you have a bad power supply or motherboard - POSSIBLY a bad CPU. If it works on the bench, then start putting it back together a piece at a time and test it each step. That's how it works.

I'm going to be frank here. Coolmax does not have a good reputation. I don't care how many watts it is, if it's defective, it ain't gonna work.

[Elendil14555]

I just tried the test and it worked, but after a few seconds, it turned off, yet again

[Cricket]

Looking at your parts list everything looks good except the power supply...it's the weakest link and I'd start there by replacing the CoolMax with something better.

Cricket

[Elendil14555]

ok, im gonna try and get another PSU and see if it works. If that is all, thx for the help. And would that be the problem with the ATX12V when i plug it in thats the problem? Is the cord u plug it in with bad?

[jayb1234]

Yes that is a possibility.

One thing to be sure to check is whether the CPU heatsink/fan unit is locked down securely. If it isn't it could be shutting down because of overheating.