Computer boots but monitor says no signal?

[Zakman3]

So I'm running the following:

P-4 2.4C
4 1GB sticks of PC3200 DDR (2 x Crucial, 2 x Corsair)
1x WD 100 GB, 1x WD 120 GB, 1 x WD 36 GB Raptor
NEC 16x DVD-RW
Antec Sonata w/380w Truepower
ATI 9800 Pro
Floppy, USB 2.0 3.5" Internal Card Reader, Coolermaster Aerogate II monitor

I added a P-4 3.0 a month ago that caused nothing but problems so I removed it- my old 2.4C worked fine but the computer became incredibly slow when booting. I went away immediately after so I didn't have time to reinstall Windows.

I came back this week and put in a new 200 GB hdd- it seemed to work fine but two hours ago the computer just hard crashed. I rebooted and it worked fine for an hour, then just switched itself off. Since then I've been unable to get it to work- it seems to boot up, all the fans spin, but nothing appears on the LCD screen. All I get is "no signal". I've disconnected all the hard drives (except boot) and the optical drive to see if it's the PSU, but no go.

Have I shorted my PSU somehow, or is it the video card? I'm at wit's end here- any help would be much appreciated.

 

[Zakman3]

Any suggestions?

 

[Gronich]

I would suggest you get a bigger PSU 480W+

I found that I used to get errors from my 9800Pro with a 400W power supply when booting and general system instability changed to a 480W and all my problems went away...

 

[Zakman3]

So now I've put in a new PSU, and tested the LCD on a different computer- still no go. I'm thinking it might be the motherboard or video card....off to try a new card :/

 

[RBBRMADE]

maybe you need more RAM?

Pull 3 sticks of RAM out and try it.

Ron

 

[Zakman3]

I tried with a known good stick of RAM and a single hard drive- no go.

 

[Genesis15]

I had the same problem when I changed my motherboard it was fixed, sounds like thats your problem.

 

[Zakman3]

The motherboard light is blinking green, as it does when normal. It's either the mobo or video card, I'm guessing- will have a new video card to try out fairly soon.