NVIDIA 7800 Won't boot

By ph1re ยท 5 replies
Jul 13, 2007
  1. I just recently bought a 7800 GS OC AGP and now my system won't boot.

    For my motherboard I have a MachSpeed (Same as Jetway it seems?) S755MAX


    For my PSU I have a POWMAX 400w Max LP-8800D


    Now, for my motherboard I set the AGP volts to 1.8v which is what I read somewhere that the videocard I bought needed. Now I can't even boot with that videocard.

    My bios for the S775 are A03 07-01-2004

    I'm really bumming right now because I don't know if I bought a broken card on ebay (which I doubt I did because the guy seemed trustworthy. Or if my SiS chipset is not compatible, or if I just need to buy a new PSU. Please help.
  2. ph1re

    ph1re TS Rookie Topic Starter

    Alright, I contacted the seller and he said that supposedly the video card I bought (EVGA GeForce 7800 GS OC 256mb AGP) requires 0.8v and I found out that my motherboard only has 1.5 to 1.8.

    Would this be the reason my videocard refuses to boot?

    I don't want to buy a new motherboard (very low budget) if it's not going to fix the problem.
  3. almcneil

    almcneil TS Guru Posts: 1,277

    Check the manuals for your MoBo and see what the voltage tolerances are. You might be able to adjust one or the other. You can find pdf manuals for them at the web sites for the manufacturers.
  4. pdyckman@comcas

    pdyckman@comcas TS Rookie Posts: 527

    Yeah..that higher voltage situation is no joke. You may want to have that 7800 checked somehow. This may be the reason that this particular graphics processor may never boot again. Does your board have integrated graphics that you can use? I mean can you return the pc to it's original config./see if it still works/and go from there. Post all the info. that you can. Good Luck. It'll work out, don't worry.
  5. ph1re

    ph1re TS Rookie Topic Starter

  6. ph1re

    ph1re TS Rookie Topic Starter

    Yeah, setting it to 4x did nothing.
Topic Status:
Not open for further replies.

Similar Topics

Add your comment to this article

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...