i have an issue with windows 7. i have a dell windows 7 studio cps 8000 with an intel core i7 [email protected] 8gb of ram 64 bit. had computer for 2 years, ran fine first year last year or so have been experiencing myriad of problems. it started with the screen would randomly go to sleep and not wake up, wasnt the cable or screen tried different for both. got really bad, couldnt do anything for about 2 weeks, finally worked again that only happens once in awhile now. now, the computer will entirely shut off, restart back up, and then freeze at log in or shortly after. ill turn off, restart and maybe or maybe not it will turn off. sometimes when it does just the keyboard will freeze, other times the mouse will freeze, other times the sounds will stop working, random shut offs and reboots have happened 7 or 8 plus times in a row. if i leave it on sometimes its good for 72 hours plus, other times it cant go 15 minutes. bsod happens ussually happens once during the succesion of reboots. sometimes it will launch to startup repair, that always freezes. i figured it was power supply connector but just not sure. i completely took it apart and cleaned everything and checked supply/connectors/fans they are all working and dust free. tower is vented. when i did take it apart and clean it initially it was absolutely spot on problem free for a week. went back to shitting up after that, second attempts at cleaning have been unsuccesful. any ideas?