Buzzing noise from the tower

Hi all, back to the gurus!!
Just tried to convert a few movies to AVI, using Freemake video converter. Gets to around 5% and then I get a buzzing sound emanating from the tower. Didn't sound like a fan hum or the like, a bzzzzz like a loud mozzie. Disconnected everything, took off the side cover and blew it out with compressed air but there wasn't a great deal of gunk anyway. Plugged her back in but same thing happens!! Any clues guys and gals??

Update: I ran CPUID HWmonitor and then tried to convert the file while watching CPUID. The line under temperature (TMPIN2) got to 80c and then the buzzing started. Does this mean I have to redo the thermal paste or something else? (It was a stock standard CPU when installed and no extra paste was used.

GEWB said:

Video rendering is very CPU intensive and requires more than "normal" cooling. The buzzing you hear is probably an alarm from/on your motherboard. 80C a high temp for many CPUs to operate. You can set the alarm temp in the BIOS.

You may need to reseat the CPU with fresh compound and make sure the cooler isn't clogged, doesn't "tilt" and make sure the case is ventilated (away from other heat sources, good air flow, etc.).

Regards,
GEWB

Thanks GEWB, thanks for that! I'll get some compound today and re-seat it. Will let you know tomorrow how it went

I've never re-seated (or seated!) a CPU before but looked up Dr Google and have used the 2 line method for thermal paste. These are the temps showing on HWMmonitor and frankly, I wouldn't have a clue if it's good bad or what.

Not so good. Tried to convert a movie and the alarm went off again. Took this snip at the time. Maybe I didn't do the re-seating thing properly?? One point of note....it did get further along in the conversion process before the alarm went off its tree!! Dunno what to do now...??

No problems with location, air flow, ambient temp etc. Should I try re-seating again........