This Gateway MD2614 laptop is 13 months old. It gets the BSOD after 1-3 minutes of boot. Sometimes, instead...the system will just freeze (like trying to reinstall, last know good config). HDD test failes for a bad sector. But another drive replaced it and laptop froze on new install, and again w/BSOD. $500 investment...do we replace the Motherboard at $200? How else can this be solved? what is likely the cause and can it be replaced inexpensively?