Member Avatar for apollo1492

I accidentally put agp in the title instead of pci the slots are actually pci. I have an ASUS p3v4x motherboard with a p3 800mhz processor. The issue im having is there is no signal going to the monitor at all. It just happened out of the blue the monitor works fine. I have tried multiple video cards that fit in the pci slot and still no luck im wondering if maybe the pci slots went bad maybe and any help would be appreciated. Need any more information just let me know.

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Dani AI

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Quick, focused steps to isolate the fault beyond swapping video cards (already tried) and the CMOS-reset suggestion in the thread.

  • Do a minimal bench boot. Remove everything nonessential (drives, extra cards, front-panel USB cards). Leave CPU, one known-good DIMM in the recommended slot, PSU, and one video card (or none if you have onboard VGA). Power the board on and watch for fan spin, drive activity, and any POST beeps from a case speaker. The minimal configuration narrows the fault to PSU/mobo/CPU/RAM.
  • Add a system speaker or a POST card. A speaker lets you hear POST patterns; a PCI POST diagnostic card will display the BIOS stop code. That code is the single most useful clue if the board is halting before video.
  • Check power delivery. Either swap in a known-good PSU or measure the 5V/12V rails with a multimeter (only if comfortable). Boards can power fans while failing voltage regulation still prevents initialization.
  • Inspect the motherboard closely. Look for bulging or leaking capacitors, burnt components, dislodged standoffs, or bent traces around PCI/AGP connectors. Physical damage is a common failure mode on older P3-era boards.
  • If the board posts but shows no video, consider BIOS/boot-priority issues or a corrupted firmware image. Reflashing the BIOS or using a replacement BIOS chip is advanced but can recover a board that otherwise looks functional.

Safety and next steps: always unplug mains and discharge capacitors before touching components, and use ESD precautions. If minimal-boot + POST card indicates no CPU/init activity, the most likely culprits are motherboard or CPU — at that point cost-to-replace will often favor a board swap. These checks complement the earlier comments from and and help decide whether to repair, rework (caps/BIOS), or replace the motherboard.

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Member Avatar for FlamingClaw

try another video card

Member Avatar for apollo1492

Ive already tried 4 different cards 3 were pci and 1 was an agp card still no signal.

Member Avatar for FlamingClaw

if the monitor cable is ok then maybe your motherboard went out

Member Avatar for PcTestCard.com

Try take the battery away from the mobo for a few minutes, unplug the power cord as well, holding down the power button over 20 seconds to discharge the mobo.

Also swap the RAM in different RAM slot and/or use a known good RAM to test.

Then put the battery back with the power cord, try the known good VGA card again.

Hope this helps!
Bill

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