New system won't post

[Wag]

AT8 (not 32X)
Opteron 170
2Gb ram (2 sticks 512mb Corssair, 2 512 mb Buffalo)
ATI X1800XT 512Mb (Just 1, No Crossfire config)
2 IDE DVD-Roms
2 IDE Pata HDs, 1 Floppy
1 SATA HD
1 Wireless PCI LAN card

Rosewill Performance RP500 PS (This one should be enough, shouldn't it?)

Assembled everything, try to turn on and nothing happens (unfortunately I broke my case speaker so I can't rely on that). MOBO LED shows "02", then goes to "00". Happens no matter what I do. Reset, unplug, etc. No fans, no nothing. When I hit the power button the LED will quickly show "F" then go "02" then "00". The LED on the X1800XT is always red.

Any ideas? I had this power supply working with this exact config in a ASROCK 939Dual-Sata2, so it should work.

Any help would be greatly appreciated.

 

[KGB]

Try booting with only one DIMM and one HDD.
In other words, strip it down to basics and see if it POSTs.

 

[dfuze]

Also make sure your IDE plugs are in the right direction into the motherboard (I've seen some that don't have a "key" on them).

Another note, take out the PCI wireless card. I have one on one of my pc's and you are supposed to install the driver cd first, then turn off the pc and install the card. Just a heads up because if you leave it in initially, it can make it harder to install the correct drivers (been there, done that ... )