in ur situation,its quite funny on what/how to go bout whats up cos u can switch off a system by pressin the power botton n notin goes wrong n also, its not adviceable...
maybe u can carry out a maintenance check up by cleanin the CPU components.
if symptoms persists then only if...
.... u have a back up for ur data, u can re-install the OS n continue with ur job.
Thats that!
If u still have any doubt, feel free to PM.