Im beginer to hardware troubleshooting , i have a pc athlon 650 Mhz , when start it it doesnt show nothing , the display is black it ,
I did change the display its doasn't  help  i also changed the disply adapter still doenst help
is there any think inside my motherborad can affect the display or is there any  test equipment ??
any help

Thank you
 

wow, alright we really need more info than that. what kind of system do you have. If everything else turning on i.e do you hear your HD spinnning etc. but just no display. Have you installed or uninstalled anything recently. it could be a number of things you need to be more specific

 my motherboard is MSI K7T Pro . CPU IS AMD Duron 650MHz , ram  pc 100  256 Mb , OS windows xp .
Ionpy changed the Display card , and then i install back , i usually do swap diaplay card it work fine , but this time the dispaly doasnt show , it toatly black , the harddisk is runing , CPU is runung also ...only the display.
Regards
Simo
 

did you uninstall the old and reinstall the new drivers for the video card that you put in? have you tried put the other video card back in?