My laptop auto restarts while i am using it

I have a problem with my laptop which restart on it's own.i don't know what is causing that.I have checked the mem with memtest, check disk, run eset antivirus, run pc diagnostics.Very weird issue.6 months ago accidentally fell down and the screen broke but i replaced it.Maybe it's from the physical damage that all are happening.Please help if you know something more.
Thanks in advance.

 

IS it getting Hot ?

 

The temps with core temp app are 40-50 idle and under full load 60-70.
Thanks mate for the help.(scary photo)

 

Well 70 is getting on the real hot side, you really want on idle 30-40 and never going over mid 60's...Since it was dropped, it probably did some damage to the motherboard..

 

Maybe, but the laptop works fine.The crashes are random not everyday.
Thanks in advance.

 

I would re-seat the Ram, Turn off the laptop, Unplug from the wall... Next remove all ram sticks, Wait 10 minutes and the reinstall and try..

 

I did but the problem remains.

 

Will this happen if you remove the battery, and use ac power only?

 

When i use ac power the problem occurs.

 

Remove the battery, unplug the ac adapter from the back of the latop.. next push in the startup button and hold for 10 seconds.. then replace the AC power Only, and see what happens..Run the laptop on AC power only..