This machine is 8 months old Specs; ASUS M2N MX SE AMD Athlon 4000+ 1 gb ram Originally, there was only 1 Samsung SATA based 160 Gb HDD with installed Win XP. Never had any problem. Two weeks back, I installed a secondary 360 Gb SATA HDD (Seagate) Since, then, intermittently every 5-10 days; I encounter the problem of computer not booting. When I check the BIOS config, it fails to recognize my primary 160 GB Samsung HDD. After I turn off computer, and restart after 5-10 minutes, the computer boots up normally. There is no problem once the OS Loads What could be the problem? Is this defect of this mobo model? Please help - i am very anxious I have never updated BIOS but will that help?