Help with new a64 rig

[obeseotron]

I just built a new athlon64 rig, and it's acting really strange. When I turn it on the computer starts for like 2 seconds, shuts itself off and then starts again for another 2 seconds and continues like this in a loop. Any ideas, I've built a lot of computers and I've never seen this specific problem.

AMD Athlon 64 3500+
Thermaltake Venus 12
Abit AV8
Gainward Geforce 6800GT
1GB A-Data DDR500
Antec p160 with Antec True550
3HD's, 2 Optical drives (tried disconnecting these already)

 

[vapidtransit]

Sounds like the problem I am having with my OLD box (see the thread I just posted)

Try taking your motherboard out of the case, laying everything out on a piece of cardboard or some such nonconductive surface and booting up.

If it works, then it means your motherboard was touching a metal part of the case and causing electrical problems.



Aside from that, make sure all your cables and components are seated properly (but I'm sure you did that already)

 

[obeseotron]

Now it seems to be making a little progress, it's more like 5 seconds between reboots, long enough for me to figure out that it is in fact outputting video, I see the bios for a split second and then reboot. I've seen computers turn on but not output video when there is metal touching something but never a problem like this.

 

[nick1985]

see if there is any metal touching the motherboard. it sounds like it may be shorting out. (check the little metal prongs sticking out from the I/O plate )