at least once a day my laptop has what all i can call a random powercut. whilst its in use it just cuts off completely as though someone has cut the power. it doesnt't go through any form of shut down protocal and there are no scans or instalations going on that would need my machine to restart. when turned back in it is as though nothing ever happened. there is not set time as to when it cuts out so it is very unexpected. on other occasions it also makes a beeping noise. the same noise it makes when a CD is inserted into the drive. but there is never actually a CD in the machine. the beep is normally followed by crackling and buzzing sounds and a program will normally crash. can anyone tell me what is wrong with my machine as i am completely stumped.