A really weird problem.... plz help!

[xXDanteXx]

Well my PC was working fine until i started having troubles with it since the past one week....

lets suppose i turn off my PC by going thru Start --> Turn Off Computer --> Turn off
it turns off fine....

but if i try to start my PC again it just wont start....
it goes into a restart loop....
some times it loads the BIOS and restarts...
some times at XP loading screen...
sometimes at the login screen...

and after every restart it says "Windows was unable to start properly the last time
please select one of the options given below

Safe Mode
Safe Mode with Networking
Last Known good configuration
Start windows normally"

no matter watever mode i choose it wont start.....
this continues for around 15 times or so..
and then it finally starts properly...

this happens only if i "Turn off Computer" if i just say "Restart" the pc boots properly without any hassles...

Assuming that i have ruled out the possibility of a corrupt OS.....
also sometimes my PC just automatically restarts....
although i have turned off "Automatic restart at System Failure"....
it doesn't give me any blue screens...

i also tested my ram with memtest86...no errors found...

also no dump files are generated, no errors or warnings in Event Viewer, No BSOD, did virus check also spyware check

Any help would be highly aprreciated.
Thank u for ur time and patience.

 

[N3051M]

could be a hardware failure coming soon..

-check hdd with a disc diagnostic utility from the manufacturer's website
-look physically at the actual hardware, note if there's any weird smells or components

if it is OS corruption or hardware checks ok, use a live cd like Ubuntu etc to test. Or use windows repair to try and fix it.

that should get the ball rolling for you..