Video Card Install, Display Flashes Off and On

By tlindsey ·
I recently installed a Video Card to support dual monitors on a pc. It worked fine until the pc was restarted and when it came back on, the primary display started flashing off and on. I reseated the card, reinstalled the drivers, changed the DVI adapter, etc...I know the cables and monitors are fine, as they work with another pc. The default display works fine, after removing the video card. I am thinking that the pci slot might have gone bad but have no idea how to test it. Is there a way to test the slot specifically? Any other suggestions?

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Don't know a way to test PCI slots

by robo_dev In reply to Video Card Install, Displ ...

Video card failed?

BIOS update for motherboard?

If the picture is OK when it's on, and the flashing is at a constant rate, I would suspect some incompatibility versus a failure.

I would tinker with BIOS settings for video...

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Also try the Video Card in a different PCI Slot

by OH Smeg Moderator In reply to Video Card Install, Displ ...

It sounds like a Sharing problem where something like the IRQ or maybe the DMA is being shared and this isn't compatible with he Video Card,

You may find it necessary to swap some PCI Cards around to get this to work correctly. Also if you have On Board Video you should go into the BIOS and switch this off. As well as Booting in Safe Mode and deleting any other Video Drivers/Software that are installed.

OH BTW this new Video Card is a Dual Head Card right? If it's not and you are trying to run 2 Video Cards to drive 2 Monitors that will be the main problem here and it's much easier to fit a Dual Head Video Card than to mess around finding the right combination of Sockets and Resources to use 2 Video Cards. Dual Head Video Cards also require less power than 2 single head Video Cards so if your Power Supply is marginal that also isn't any help here.


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Flashing/Blank Display

by nightcloak74 In reply to Video Card Install, Displ ...

A flashing display can be caused by blown cappacitors on the board, or video settings too far out of range for the monitor. Since no operating system was mentioned, I will be giving instructions based on XP. If you can get into Display Properties(right-click an unuse area of your desktop, then left-click "properties"), then you should try reducing the resolution under the "Settings" tab. If that fails, then you may try the "advanced" button under the before-mentioned "Settings" tab. In advanced settings, you can change the Hertz value of your video output. This is done under the "Monitor" tab. Too high or too low a setting, can keep you from seeing your display. You should look up your monitor info before you do this, as bad settings here can hinder you in checking other problems. If this doesn't work, you may want to check your motherboard for blown capacitors. They will be bulged out at the end, kinda like a soda someone left in the freezer. There are other things that can cause your issue, but I would like to rule these out before I end up writing a book.

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