I have a low-end stock Compaq Presario desktop running Windows Vista operating system (ugh!). This PC was purchased in maybe 2008 or 2009. Of late, the CPU cooling fan will randomly switch from normal to high speed. When it does the PC hangs/freezes (stops accepting mouse and/or keyboard input at least). Additional system details are as follows:
Compaq Presario Desktop SR5710F
Windows Vista Home Premium (32-bit) SP2 DirectX 10.0
Phoenix Technologies version 5.31 BIOS 512 KB ROM
ECS Iris8 motherboard / nVidia MCP61 chipset
Nvidia GeForce 6150SE NForce 430 video card w/ 120 MB memory
3GB DDR2-SDRAM (PC2-6400/800 MHz) memory
230 GB SCSI Hard Disk
AMD Athlon X2 4550e 2.31 GHz
HP w1907 lcd monitor
I have run diagnostics, antivirus, disk check, etc., etc. to no avail. CoreTemp and HWMonitor software for monitoring CPU core temps suggest that they are not getting very hot. Temps tend to stabilize around 30°C give or take at idle. Other than Google Chrome, AVG 2013 Free Anti-Virus and the temperature sensing programs mentioned above, just about every other piece of software was standard issue that came with the machine. I've been jumping through hoops for an individual that responded to my plea for help on an HP Forum. Supposedly, they work for HP.
The only other piece of information I can share is that the PC power supply did get fried in association with a power outage event maybe 1½ years ago. Luckily, I was able to find an identical replacement power supply and everything has worked just fine up until maybe a month ago.
If the the CPU core temps are not getting all that hot, what else would cause the CPU cooling fan to kick into high speed? Just because the CPU cooling fan switches to high speed, is this a reason for Windows Vista to lock/freeze?
I would greatly appreciate any help and/or advice. Any ideas?
Compaq Presario SR5710F, Vista Home Premium (32) SP2, Phoenix v5.31 BIOS 512KB ROM, ECS Iris8 / nVidia MCP61 chipset, Nvidia GeForce 6150SE NForce 430 video w/ 120 MB, 3GB DDR2-SDRAM (PC2-6400/800 MHz), 230 GB SCSI Hard Disk, AMD Athlon X2 4550e 2.31 GHz, HP w1907 lcd monitor