I have an HP ProBook 4530s that as soon as you hit the power button until you turn off the laptop the fan runs on what seems like a high speed. I have replaced the thermal paste and cleaned the inside of the laptop but that did not fix the problem. I replaced the hard drive about a year ago with a Crucial MX100 SSD drive and did not have the problem prior to that. I'm not positive if that is the problem as it didn't happen all at once. It just got progressively worse until it just constantly runs. However, since installing the SSD drive I have not been able to leave the laptop running because it will eventually crash. I'm not sure if it is overheating or what is going on. Does anyone have any suggestions as to what I might be able to try?