It may be a power problem. Try to borrow an appropriately sized PSU to test with.
Do you occasionally have problems booting the system?
Tnx for answering...
Everything works fine, no problems whatsoever with rebooting.Well I have to tell you I have more problems with my mouse.Keyboard is shoting down too but not that frequently as mouse.I have Razer Kexboard and mouse and first i thouth that this is a razer driver problem.So i updated those drivers and the problem remains.
If U think that is a PSU problem can I test it somehow?