PC Won't boots it restarts itself

Jackey Force

Honorable
Jul 3, 2013
65
0
10,630
Hey guys today I taken out the whole components out the cabinet and cleaned it, it was very dusty so till that everything is ok and when I reinserted all the components still it was ok I used my pc fine since then but only one problem I have is that I have no thermal paste with me and my pc was working without that and the previous paste is dried since 2 years, Now when I start my pc is restarts on its own and never boots just shows up the mobo logo and restarts I have tried going into the BIOS setup it there the CPU Temp is about 75-80 Degree celcius, I guess due to the temp it is restarting? Please help me guys about what to do here.

PC Spec here
AMD FX6300 3.50Ghz
8GB DDR3 RAM
R7 250 1GB GDDR5
1TB Toshiba HDD.

I want my pc to get work ASAP otherwise my gaming channel will go down without the gaming pc sadly :(