Question Windows 10 freezes at normal start up, hibernation startup and when waking from sleep mode ?

Jun 1, 2021
Hi I recently changed the thermal paste in my laptop and since then the laptop is having windows problems such as not booting up at previous pace and is stuck at welcome screen, and if turned on from hibernation or sleep it shows black screen or just freezes ? Please help me to find out if it is a hardware problem or software. I have made changes in startup application and disabled all but yet the problem exists. The games i used to run smoothly now lags and shutters every 10 sec, i don't know what's going on .

An incident while servicing, the serviceman had forgotten to unscrew a middle screw and he tried pulling the lower laptop cover off and I heard a crack sound, could that have damaged the motherboard ?