I had opened up the PC and reconnected all the wires yesterday. after that computer boots to "Starting Windows" screen of Win7 Ultimate 32-bit. but then it stops working and shuts itself down after a couple of minutes. I've tried installing Win7 from a new DVD, but that installation hangs too at "Windows is loading files > Country > Repair/Install > Loading Setup."
Could it be a hard disk issue? The HDD is 15days old SeaGate Barracuda 500GB SATA 3.0GB/s one.
Look at my post carefully. I've written 7200.12, not 11.
There was no problem with the PC before I opened it up that day except some heating issues. (Processor temp. goes up to 75C while playing heavy games). And yeah, I was bored back then and I am still learning stuffs..
I looked at your post carefully, I was talking to Jack, not you.
So you opened your pc and re-connected all the cables for no reason? That makes no sense but obviously you did something if the computer won't boot now. Lesson learned, if it aint broke, don't try to fix it. I don't see how it could be a hdd failure if it worked fine before you messed with it.
Check your heatsink is on securely and recheck all you hardrive connections, make sure the power and sata cables are secure at both ends.
75c is very hot for a i3-2100, mine never goes over 55c even in prime95 stress test. What kind of case cooling do you have? Try taking the side off the case, if that reduces the cpu temp a lot, then you need more airflow.