I'm having a problem with HP 625 laptop, heres the thing.
When I press Power button fan spins for 0.5 sec and then stops with no sign of life, the only thing alive is LED indicator on Power Button itself. Then I disassembled whole laptop to notice CPU and GPU is working as it heats up although fan is not spinning at all.
I tried switching CMOS battery and putting in known good RAM stick instead of the current one.
The only way I could get fan spinning is when I power it up without AC adapter and while it is already turned on I plug the AC, then the fan starts spinning, otherwise not.