laptop very hot screen goes black

MOUNTVERNON

Honorable
Oct 20, 2013
23
0
10,510
I have a hp pavilion dv7 notebook pc intel core i5 m 460@2.53GHZ 2.53 GHz 64 operating system ram 6.00gb ati mobility radeon hd 5470

My son plays Minecraft online and lately the laptop is running very hot and twice the screen went
black. How do I prevent that? How do I test temperature of laptop? Any suggestions? Do I need a better video card?

Thanks in advance