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08-03-2012 10:31 AM
This happened without any prior problem. When the computer is started the monitor lights up briefly with a DVI VGA no signal message, then goes to sleep. The monitor says the default source is the DVI. I plugged the monitor into another computer and it worked although I did not do anything except hook it up to a computer that was on and the monitor showed the current site that the computer was on. I have tried rebooting, F8 etc but never get past a blank monitor. Any advice would be appreciated.
08-05-2012 02:39 PM
It could be the power supply, shorted device of any kind attached (bad printer, flash drive, keyboard, mouse, network connection), memory problem, video card fan not spinning and the video card could have overheated, bad capacitors (rounded or leaking a brown or dark substance). The first think you should do is make sure it is not under warrantee. If it is, contact HP. If it isn't, remove the cover and inspect the board for bad capacitors, fans not turning, disconnect all non essential items like the hard drive, DVD, floppy if you have one, all external devices (yes the monitor) and turn on the computer. Does it appear to stay on? If yes, shut it down by holding in the power button for 5 or more seconds or flipping the power switch on the power supply or pulling the plug. Connect the monitor and then one item at a time leaving the hard drive with your important data as the last item. If it didn't stay on. Try to use only one piece of memory and try each memory slot, try the next piece etc. If that doesn't work, the best guess is the power supply (if you have an ohm meter - test the power supply first).
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08-06-2012 10:03 AM
Are the fans spinning up in the computer?
Is hard disk working?
Can you test another (working) graphics card?