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Monitor gets no signal

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Today I tried to hook up computer I had laying around. I plugged everything in, turned it on and kept getting "SELF DIAGNOSTICS CHECK SIGNAL CABLE NO SIGNAL" I tried reconnecting the cable but nothing changed. I hooked the computer up to another monitor with that I know is working still nothing. I hooked the orginal monitor up to another computer and it worked fine. Then i tried to use a different cable (one that is currently working with another monitor and computer) and it still didnt help. Anyone have any ideas. I used this computer about 4 months ago and it worked fine.
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Your gfx card sounds like it has been naffed in some way since you last used it. Is the monitor plugged into your gfx card( if you have one) and not integrated gfx port. If you arent in the situation try removing the gfx card and reseating it.
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    Je suis Napoléon!

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so did the monitor work on another computer? (sorry wasn't clear in your post) if you have the ability to....try using the grafix card in the other pc and see if it works there.
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