Question CPU fan suddenly running really fast (and loud!) at startup

Oct 18, 2021
2
0
10
Hi all,

I have an old Packard Bell desktop PC. I've had it a few years and, although it's not the fastest, it's fine for browsing the web and watching YouTube.

I switched it on earlier today (all was fine when I turned it off last night) and the main fan is going really fast and sounds really loud - a bit like when a PC is running loads of applications and is getting hot.

But this issue is from cold, right at the bootup, so I can't imagine heat is an issue.

I've tried a system restore to a few days back in case the latest Windows 10 updates had caused an issue, but that didn't work.

I then reseated the CPU with new thermal paste and cleaned the fan and heatsink - still no change.

The PC is running absolutely fine - but I have this noisy fan that sounds like a vaccuum cleaner!

It doesn't sound "broken" - just noisy as if the CPU is hot,

Any ideas, folks?!