Windows 7: Infinite reboot loop

Hello everyone.
I am running windows 7 64 bit on my desktop.
System specs :
Intel core 2 quad @ 2.83 ghz
p5q pro mobo
4 gb ram
600 watt psu cooler master

Now i have been diagnosing my pc for some time now , the latest problem has been automatic restarts very frequently.
This problem arised while i was reinstalling the thermal paste of my gpu and fan.
It did go well and the temps dropped to 45 c in idle but a new problem started , reboots .
I tried these things till now :
clean boot
safe mode works fine (mostly)
run it with 1 stick and 2 sticks of ram
resetting the bios
start up repairs
and a lot of things that i do not remember



for the moment , safe is working but normal mode wont start . As the windows logo comes , it shuts down altogether and restarts again and so on.

I tried disabling automatic restart and got a bsod once.

Error was : 0x0bad0020