I have a very old MSI R4870-T2D512 OC Radeon HD 4870 512 MB video card. Recently, I have been having crashes with video signal losses even if I am not gaming, but watching a streaming YouTube video in my Mozilla's SeaMonkey v2.35 web browser in my very old Windows XP Pro SP3 machine.
I noticed my video card was very hot outside on its vent and inside the case. I checked the very old Catalyst Control Center v8.60 (can't use the newer versions since they hard lock up rarely and randomly [no video signal losses], and noticed its ATI Overdrive's status showing its fan speed is at 0% even though its "Enable Manual Fan Control" option is unchecked for automatic fan speed control. If it the card is very hot, then shouldn't its fan be spinning (not 0%) by itself? Currently, I am testing it with forced 55% fan speed to see if I still get crashes and video signal losses. I wonder if my video card is broken with its heat sensor?
Thank you in advance.