For the past few months, my CPU load has been rapidly increasing and decreasing (between 15% and 100% for all four cores), along with the fan speeding up and slowing down for no good reason - while the computer is idle. The fan will go from 1000RPM up to 10 000RPM. I turned off all my startup programs, but the problem persists. I have recently updated all my drivers and my BIOS (I did this to try and amend the problem).
Here are my computer specs:
MS Windows 7 Home Premium 32-bit
Intel Core 2 Quad Q9505 @ 2.83GHz
Yorkfield 45nm Technology
4.0GB Dual-Channel DDR2
ASUSTeK Computer INC. P5QPL-AM
AMD Radeon HD 6870
Thanks for the replies. I ran a virus scan with AVG full edition, and there were no threats detected. Then I rebooted in Safe Mode, but even while my computer was rebooting, it was very loud, so the fan was obviously running fast then, without Windows running. So this means that it's not a process? How would I check for a failing hard drive?
Another thing I'd like to know is if the rig is clean of dust and fabric fibers.
There is a possibility of bad thermal conductivity between the processor and it's heatsink, if
1: The rig is too old, thermal paste is dead.
2: The fans have got clogged with dust and fibers.
Thanks, I've run run Crystal Disk Info, and both hard drive have Good health statuses. Is there anything in particular I must tell you from this report?
It could be dust - my friend added new thermal paste about 5 months ago, how often should it be applied?
Not too often, thermal paste needs to be applied only if it's gotten too old and you feel temps are staying high even under normal states.
Did the sudden fluctuations start after the new thermal paste was applied? or did they just start recently?
You need to blow the dust and dirt out of the case ASAP, use a compressed air can if you can get your hands on one.
i have seen these sysmtoms when a virus or worm is active on a system. they run cycles that max out the cpu for a few seconds causing the fan to speed up and slow down...
get the usual suspects (for me, malwarebytes, spybot, avira free) and scan