My old but reliable Toshiba Statellite lap top, which I installed max 3GB RAM on to last Xmas has been running brilliantly since. It copes (just) with HD video editing which I do on Corel video pro 4 software. Having edited the footage I sometimes burn it to DVD or up load on to you tube. That's where a problem has developed recently. When ever I try to render footage of more than 3-4 minutes it switches off. I can tell it is struggling for power and have tried everything to clear unwanted programs and files to give it a chance. Is there anything else that will help?