Fan always running on Presario 2700 laptop followed by immediate shutdown
Posted on 2006-04-19
I have a Compaq Presario 2700 laptop. Within 15 seconds of turning the machine on, the processor fan runs and after 5 more seconds, the main fan turns on. Both are running at high speed. After about 60 seconds (less time than the machine takes to boot completely), the machine shuts itself off instantly.
My first thought was dust, but after cleaning it still powers off. I checked some other threads that mention the heatsink becoming electrically diconnected from the motherboard and causing a ground fault, but I have used silver epoxy on the lockdown nuts and now the electrical conductivity is fine.
I have checked the heatsink, and it doesn't seem warm (at least cooler than my other laptop that does work properly). Since the fan runs from startup, I believe this is hardware, not Windows related. Both fans are functional. The BIOS does not have a temperature monitor from what I can tell and Compaq doesn't seem to offer a diagnostic CD from what I can find on the webstie and the media I have from purchasing it. The machine is about 4 years old, way past warranty. Any advice for things to try or diagnostics that can be run? Since the machine can't be on very long, I am limited by the tests I can run. Any diagnostic ideas would be greatly appreciated. Thanks!