I am no stranger to building PCs. Been doing so for 10 years now. Recently, I encountered a strange problem whose root cause I cannot identify.

I was replacing the 6600 from my friend's PC with a 7800 GS OC from BFG. Installing the hardware went fine. Made sure to plug a power connection into the back of the card. When I go to plug in the power supply cord, having unplugged it during the installation, all the fans come on and stay on. I have never seen this before and searching was not helpful.

Hopefully someone here can shed some light on my problem.

Thanks in advance.

Does it work if you put the 6600 back in? You may have a faulty 7800 GC.

Yes, everything works normally when the old 6600 is put back in.

The 7800 "was" working a few days earlier as it belonged to a mutual friend who recently upgraded.

Has anyone ever experienced this? When plugging in the power supply, all fans turn on and stay on? Not even turning on the power via the switch. Simply plugging the power supply in!!!

Just out of curiosity, could you give us the specs on the PS - brand, overall rated capacity, rated power on the 12v rail, age?

Have you tried depressing the front power button for 10 seconds to see if this shuts off the unit after plugging in the cord to the PS?

I have tried pressing the power button. Everything turns off. When the power button is pressed again, same result. All fans turn on. No Boot. No beep codes.

Also, the PS is a SilenX Extrema 600W. So I don't believe power is an issue, however, the PC does have 4 SATA HDs, big Sound card, 2 optical drives, fan manager with big LCD.

I wish I had another AGP sytem to test the card in, but I don't.

How many amps on the 12v rail. That card requires 20-22 or something I believe. my old system I handed off to my gf when I built my new one had a thermaltake psu with only 18 amps on the 12v rail hoping it might cut the cheese and I got this card for that pc, and it turned on fans blowing no boot, got a new Ultra PSU with 28 amps on the 12v rail and presto she booted up.

Well that is exactly what is happening to me.

Let me look up the PS specs...http://www.silenx.com/productcart/ [...] product=56

Output: 600W
3.3V - 32.0A
5.0V - 42.0A
12.0V - 36.0A

That should be plenty of power but as I said above, he has a lot of "extras" installed.

EDIT - I might have him try and unplug all extras and just try booting with only the video card and boot drive. I'm running out of options.

bluefishreg, I have exactly the same problem. Sorry to highjack the post but I need a solution as well for my BFG 7800GS

How can you tell about the amps/rails? I have no idea. I do have a 400W though.

I have tried reinstalling xpHome.
Ive checked the card works in another computer.
The molex is in.
Bios and chipsets updated as much as possible
Amd Athlon 2.8+, 3Gig ram



The only things I have left to try is:-
F8 >> Enable VGA Mode
Enable P2PdeepFIFO in BIOS -- However you do that???

Will

was this issue ever resolved?

I just got a 7800 and i am having the same issue.

I sent the card back to bfg for an RMA and got a different one (same model) back today.

before i sent it to bfg i replaced the power supply with a new 500w dual rail 25amp bfg model

like yours, the card powers up and the fan runs but the cpu will not boot... no beeps, no bios, no nothing.

I have an older abit mother board but it is agp 8x...

this is bizzare.

any help would be great

Had the XFX 7800GS AGP in my last system and never encountered any problems with it ,dont think its your PSU. The problems you are encountering are very bizarre.Check with BFG support as they are both BFG. They may have had some similar problems with other customers.

Having similar prob's with my agp 7800 gsoc.
im currently using my xps to make this post using x800, but when i put in the 7800, the computer turns on fine, will even boot to windows, as i can see the hard drive working and even hear the sounds of windows, but the 7800 will not put up any image on the minitor.
trouble shot it a few ways,
tried several minitors, and hdmi adaptors, tried dif power supply, tried unplugging all devices cept graphics card, and then i tried card in another pc, and it worked fine, sad thing was.. that pc has a lower power supply then my main machine. so wth?

current pc spec is

dimension xps gen 2, 640w ps, 1gig mem, 3.0 p4 w/ht, bios v. A03
any help would be appreciated, thanks

I have a similiar problem with the BFG 7800 GS (AGP). Worked great and rock-solid stable for almost 3 years then it died and none of the two replacement cards BFG sent has worked (no video or beep at boot).

Supermicro X5DA8
550W PSU
2x2.66 Xeon
3GB ram
4 HDD (3 SCSI, 1 IDE)
1 DVD ROM

My previous video card, a Radeon 9800 Pro, works fine in the system.

The PSU has 40A on the +12V. I tried disconnecting the hard drives and DVD, still no video output.

I remember having the same problem a while back by replacing a mx440 with a fx 5900. I to had flash the bios to get the card working.

I used to use 7800gs also, but from Evga and i got to say, i have never seen this problem on mine old computer.

I was using amd 2500+ , 1gigs of ram, and NO NAME PSU which is about 350 watts; however, i do not have alot of "junk."