pc freeze with sound

Hey ppl!

Im on a lenovo laptop that is set up as a gaming rig. It can run crysis on everything very high and shadows medium without any problems. Today i had my first problem and it seemed a bit serious so thought i would ask you guys what might have gone wrong.

I was with my friend playing on the last level and everything was smooth and running great then out of nowhere the computer completelylocked upwith a loud, sustainedbuzzing sound continuouslyeminating from the speakers. It was really random and rather alarming. We restarted thelaptop and booted crysis back up and finished the game with absolutely no problems...it was as if nothing happened. So do you guys know what the heckthat was? Perhaps a random freeze or memory leak or something?I have 4 gigs of ram which is plenty. There was no overheating issue and the power supply adapter was a bitwarm but not anymorewarm than usual. No viruses on my pc either.I have been playing crysis on this laptop fora couple months now and never had this issue. What the heck happened and how do i prevent that from happening in the future?

In case it is relevant i will say that on the very odd occasion the sound stutters for a second sometimes on any program but only for a second and that is very rare.

my specs are intel core i5 and ati hd 5730 and 4 gigs of ram....direct x 11 :P

fps in very high on crysis is typically mid 30's throughout all of the gameand i play on low rezolution so as to avoid lag

Hey!

I was worried it was overheating but crysis has nevr caused that for me. To be sure i just sat down for a couple hours and played half the game, including the very gpu intensive levels, running it longer and pushing it farther than i did when my friend was over.....i have a temp monitor i always use....and as usual and also after this gaming session i just did....the tempuratures were far below dangerous levels for my parts. So it definetally wasn't overheating, cuz of this and also i use a laptop cooler to be safe always. So it doesnt seem overheating was an issue.

The ram thing might be possible i suppose i should check that. Theres two other possibilities that im considering...1 is the fact that my sound card sometimes stutters on the rare occasion...this time it might have caused a lock up due to the stuttering. The other is this lenovo laptop has an emergency button that opens up One Key Recovery which is a system recovery tool. It is possible my friend accidentally pressed that during the game.

Whatever happened it was very random and its never happened before and doesnt seem to be happening again,so at least it isnt recurring. Other than this incident this laptop always performs better than i expect it to its great.So weird. Hardware glitch maybe? Ive also been told when you set the sound quality to very high in crysis there are issues....could have been a multitude of things. I dunno what happened lol.