My screen still black when I turn on computer

[sbobi]

I have this problem, when I turn on computer my screen sometimes is still black, fans are going but only screen still black,
then I push a reset buton and everything goes ok. Iam tried everything change RAM in other slots, graphic card to other slot, but not solve for that problem.
Have anybody suggestion for my problem?
Thanks a lot.

 

[Dark Lord of Tech]

Are your drivers up to date?

 

[sbobi]

yes I have......today everithing is ok, I turn cmp and its working....but maybe at the evening, if I turn on computer second time, it cant