Overheating CPU

[Topkiddy]

Hi,
I have an old Phenom II 720 that I run as a media server and number cruncher.
I tend not to look at it that often as it sits in the background.
But the PSU blew a week ago and when I restarted it I noticed the CPU temp hitting 80 degrees. So I took off the cooler, cleaned it up and reapplied thermal paste and started it again. Still back up to 80 degrees.
The PC is run at stock but I'm at a loss as to why its not over heating.
Any ideas?
Thanks,
Anthony

 

[james_2k]

the mounting hardware in good condition? no stripped screws etc? all case fans working? what was the normal temp like?

 

[Topkiddy]

Yes all that looks fine. Last temps I remember were around 45 degrees.
All fans working. Case temp 30 MB temp 27.

 

[james_2k]

reset cmos? sounds weird to be honest. i assume the heatsink is clear of dust?

 

[Topkiddy]

I've blasted the heatsink with compressed gas so I'd say so?
Can heat pipes get blocked?
It's a stock cooler.

 

[james_2k]

dont think so, maybe it was a bad mount, try again using a very small amount of paste i guess?