when i turn my computer on it boots up goes thru the xp loading screen then when it should be at the logon screen it stays black and then the screen goes into power save mode (sleep mode)and then it restarts again and screen turns back on then it goes to the windows error screen where it asks if i wanna start it in safe mode and i start up normally and it normally works and then everything is fine after that. my computer is brand new i having just constructed it myself from parts i bought. im not sure weather this is a problem with the OS or the hardware but im guessing it is software because windows loads up. does anyone know what might be wrong, my bios up to date. thankyou.