If your mobo has a vga/dvi port built onto it (meaning native graphics on mobo) then yes. Since you reformatted you could try to clear the cmos and drain the caps. Unplug the computer, unplug the power supply from mobo and remove the cmos battery on the mobo. Press and hold the cmos reset button until the caps drain. This takes about 2 min. Only do this if you have a cmos reset button. This procedure will reset the mobo. Put the battery back in, connect power supply and start it up with the GPU card in. Sometimes high heat can cause strange artifacts to show up on screen. I have found that a "system reset" generally clears things up. If you machine does come back to life, I strongly suggest you monitor temps of critical components and stop OCing if you are. If your machine doesn't come back to life, IMO, it is likely to be overheated (in order) gpu memory, GPU, mobo.
Or go to Fry's get a cheapo returnable gpu card, put it in, start it up. If all is fine, then its the gpu card. If not... then most likely mobo. Find the root cause, then return the gpu card (the one you bought for testing).
Drommon
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