New PC trouble

[Cyberdemon]

I'm in the process of building a PC for a friend. The specs are as follows:

P4-2.8ghz
Corsair 512 mb DDR400 DIMM
ATI 9800 Pro 128mb vid card
350 Watt PSU
ASUS P4S800 Mobo (SIS 648FX Northbridge)

I put these together, and the powerswitch powers up the motherboard and the fans on the CPU and vid card. Everything stays powered up, but the vid card is not sending any signal to the screen. I also was not getting any warning beeps from the motherboard. I tried removing the video card and just seeing if the mobo would give me any error beeps with nothing but the ram and processor installed. It again powered up, but no beeps. The speaker was connected properlym and all the power connectors were in the right place. I tried clearing the CMOS but that also didn't help with anything.

Anyone have any ideas? Theres no jumpers on the motherboard that could be set wrong, and at this point I can't tell if something was damaged or not.

 

[RadDreamer]

AGP is VERY picky about its seating, remove the card and firmly and very straight replace it and when you screw it down ensure that its not moving. I know this sounds stupid, but trust me ive seen it happen many times

 

[Swampster]

Try a different video card just to see if it will POST. If it still won't give a video signal or otherwise attempt to POST, then the AGP controller on the motherboard is bad . . . RMA time.

If it is any consulation, I am a long-time ASUS user, but have had several of their motherboards do the same thing in the last 3-4 months.

 

[Cyberdemon]

I checked the seating several times. The mobo has a lock that clicks in to make sure the AGP card is totally seated, and I know I had the same problem on my pc.
I checked the seating on everything including the ram and CPU.

Shouldn't the CPU throw some error beeps? I tried 2 seperate pc speakers and neither were giving any error messages. I tried powering up with the ram DIMM and video card out and again no beeps.

 

[ROTC1983]

Did you plug in the extra power connector to the vid card? I forgot to do this once and the beeping went haywire

 

[Cyberdemon]

Power connector was plugged in and the vid fan was running.

Again, there were no beeps at all. No matter what.

 

[Zelmo3]

I had a similar problem that the tech support diagnosed as a bad ground between the motherboard and the case. I suspected a bad PSU, though, and borrowed a friend's to check that. It worked with his PSU, so I went out and got a new case with a more powerful PSU (needed a new case anyway-- mine was some ancient thing I bought from the electronics market in Korea), and have no more problems.

 

[Cyberdemon]

Your mobo would powerup but not actually run? I would think the 350watt would've been ok, esp since no devices were hooked up other then the essentials. I can try a different PSU though and see what happens.

 

[altonb1]

I didn't check the specs of the Mobo, but does this have on-board video? if aso, check to see if there is a jumper/dipswitch setting that disabled on-board video and allows the video signal to become primary.

 

[Cyberdemon]

No onboard video.