rgb no input signal

my friend just installed a MP3 player software on his machine and when it finish he got a message:

rgb no input signal

he cant boot up or do anything.  i have tried last good known config and safe mode and these dont work either - it keep returning to a black screen with white writing telling us: rgb no input signal

how can i fix this?
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ellandrdAsked:
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twstechservCommented:
That sounds like a video card or monitor problem.
If you have a spare monitor try that. If it doesn't work then see how his monitor is hooked up. If he has both a video card and an onboard video, try switching to the onboard video. If not try to find a spare Known-working video card and try that.
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ellandrdAuthor Commented:
ok.

can i switch between video card and onboard card in setup (F2) ?
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twstechservCommented:
You would need to just switch the monitor cable to the port that is closer to the top of the tower. But I would check in the setup if it doesn't work. Every once in a while, that option in setup will make a difference but not very often.
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ellandrdAuthor Commented:
there is only 1 monitor socket in the back of the tower
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twstechservCommented:
If it is up above near the mouse and keyboard ports then it is the onboard video. If it is down lower it is a video card. Either way, you should try swapping monitors first and if that doesn't work (which is very likely) then try a different video card.
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ellandrdAuthor Commented:
ok, well he dont have any spare monitors and im using a laptop.

the socket is blue and its near the bottom.  the mouse and keyword holes are at the top.

i think we will just bring it to town and see if we can get it looked at by hardware support and repairs shop...

thanks for helping
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