Have a 3 year old Toshiba Satellite x-205 with dual Nvidia GeForce8600M GT cards. Got the 3 beep black screen a few days ago. Charger and batteries check out fine. Suspect the nvidia cards have died. Got no power whatsoever. Previously had a few episodes of system blacking and shutting down. waited about 15 minutes and repowered and rebooted with no problems untill now. Lots of posts of bad chips/boards Nvidia 8600. Any advice on replacing card(s) with ati radeon or another card. Thanks