simple.... i think
does the computer itself stay on when this happens?
i so its a graphics card issue
could be overheating, so you probably need to get a bigger heatsink for your card or buy more fans :) 10 bucks each
yea... only sometimes that works.... what you have to do is go into your router settings
ie. 192.168.0.1 // username: admin password: password, assuming that you haven't changed your password (if you have replace password with the pass u used)
then goto a security option and choose the...