Hello,i have a compaq evo d500 it worked before one week but not now.]
I started it but no display i changed graphic card its the same pls help me pls.
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Try this 1
Reset your BIOS settings
Turn off your PC and remove the power chord --> Open the cabinet --> Remove the CMOS battery for 15-30 minutes and then put it back properly. Now plug the power cord back in and switch ON your PC.
Click on the below hyperlink "CMOS Battery" if you don't have any idea about the CMOS battery
CMOS Battery
If the problem still exist, click on the below link and follow the instructions in "Hardware Reset".
http://en.kioskea.net/faq/1192-lost-password-resetting-the-bios
Good Luck
Try this 1
Connect your monitor to the onboard VGA and check if you are able to get the display or not.
Good Luck
If the problem still exists even after performing basic troubleshooting and having a working RAM and Video Card then there is a fault in the motherboard.
Good Luck