I had this issue and swapped everything out. Then I swapped the motherboard and it was cured.
When I press shutdown in windows the system reboots..and in linux the system doesnot respond,it just shows a blank screen.So i need to switch off power every time i need to shutdown.So when i need to poweron my system , it doesnot show display.But after I remove the CMOS battery and placed it again , the system boots without any problem.I tried by replacing CMOS with new one , but still the same problem.So inorder to poweron the system , every time I need to remove CMOS battery and place it again .
My system configuration is ,
MotherBoard - Intel Desktop Board , D865GVHZ
Process - Intel pentium 4 , 1.6 GHz
RAM - 512 DDR2
What may be the reason for this problem..help please...