Question : Problem: MY PC SOMETIMES DIDNT BOOTUP TO START WINDOWS VISTA

I HAVE APROBLEM MY PC DIDNT BOOT UP SOME TIMES AND THE SCREEN STILL BLACK AND I MUST PUSH THE RESTART BUTOON TO OPEN IT
THIS PROBLEM HAPPEN TO ME ONE TIME FROM TEN
AND I WANT TO SAY SOMETHING MY BE WILL HELP THAT IT HAPPEN ALWAYS WHEN I INSTALL WINDOWS ON THE FIRST RESTAT AFTER COPYING AND INSTALING VISTA FILES THE SCREEN STILL BLACK AND I MUST RESTART AND THEN IT BOOT UP
AND ALSO I FEEL THAT IT HAPPEN WHEN I INSTALL THE ATI DRIVER

AND SOME TIMES ABOOT SCREEN APEER TO ME SAYES PRESS F1 OR F2 AND ENTER BIOS ?

PLEASE WHAT IS THE PROBLEM EXAXCTLY I WANT TO FIX IT
IS IT A BIG PROBLEM ?
AH I FORGET TO SAY THAT SOME TIMES I HEAR LIKE ASHORT SOUND WHEN I ON OR OFF THE BUTTON OF MY POWER SUPLAY FROM THE BACK

tHANKS

Answer : Problem: MY PC SOMETIMES DIDNT BOOTUP TO START WINDOWS VISTA

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