Monitor dies

I am trying to fix a friends computer.  When the Unit is turned on the Monitor light goes from green to yellow and the display doesn't even get to the POST.  Any suggestions?
dobbynpAsked:
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CrazyOneCommented:
Change the video card.
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philby11Commented:
as Crazyone said
it could also be the PSU (power supply)
does it sound like the system is booting up?
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philby11Commented:
if you can hear the HDD spinning up as per normal & all the fans are spinning .
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LucFEMEA Server EngineerCommented:
Can you check the monitor on another computer, if it works there then your videocard is bad, if it doesn't work, your monitor is bad. As far as I know this is the easiest way to test these problems.

LucF
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Huseyin1Commented:
make sure the power cable and the other cable connected to the monitor are tightly in place.
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dobbynpAuthor Commented:
Thanks to everyone for your help
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LucFEMEA Server EngineerCommented:
Glad to help
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