Electronics Repair Questions? Ask an Electronics Technician
Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model number of the "...hard drive...640GB..."
Appreciate the additional information.
Would a LINK to an online seller where a replacement Hitachi 0A37991 may be purchased serve your need please?