power on problem

ok guys i need a little help on my friends pc. he has an amd 3500 plus, bfg 6600, cosair 1 gig (2x512), and a bfg mobo. the problem is when i hook up my 600w psu and press the power switch it turns on for a second then turns off(no post/video). right now this not in case it laying on a peice of card board, but its not touching any metal, still could this be the problem?if not what could?
also all componits r tested except the mobo and cpu,and r working
thx alot for the help!!!!

 

Looks like you havn't connected the 4 pin power connector to the motherboard to give the additional power to the cpu.

 

I doubt it, if that was the case, it would probably power on but nothing would happen (screen blank, keyboard not functioning, etc). What make is the 600W power supply? If it's new, it may be a faulty unit, if it isn't, it might not be a very good unit to start with. Check that you haven't disloged the cooler, and check for any potential problems with components inside the case.

 

im useing the psu in my pc so i kno its working, the heat sink is tightly fit on with artic cream. im almost positive i used the 20 to 24 pin convrter but ill try again to make sure. is there anything else that could cause this problem? thx again i love ad tech support

 

This was the cable i was referring to-

 

oh lol yeah i have that in. is there any other possible problems that would cause this?

 

k ill try that, and no the video card is just standard no extra power connector, and its working. im getting a new case and psu sometime this week and im gonna try hooking it up in that but some how i think the mobo might be bad, its the only conclusion i can come to with theses symptoms.

 

Is the PC new? If not, did it work with a different power supply?

 

the PCs not new, but the power supply works perfectly fine in the PC im using right now i dont understand why it wouldnt work in my friends.

 

What are your hardware specs like compared to his?
and once again, what make is the power supply?

 

antec is the make not sure why that matters seeing as its working. but my spec on the pc are roughly the same amd 3500+, nvidia asus nforce4 chipset. and a 6600 gt with ocz 1 gig (2X512)

 

The make is very important, as cheap-ass power supplies can break well below their rated wattage, and take all the components in the PC with them. With Antec you should be quite safe though.
If the motherboard in your friend's PC hasn't been tested and is new, it may be faulty.

 

so it not being in a case would have no bearing on the pc not working correct? also would the pc not being in a case hurt it?

 

Just obviously bear in mind you do still need cooling if you're running a PC without a case for a while.