Hi all Just request a help . sorry for my bad english my friends pc is can't boot up & i doing a format , & also update the bios to latest one , so my problem is after format the PC the hdd can't detect but can work externally so i not sure what is the problem is, PC Model Toshiba Satellite C640D Ram 1 G Hdd 320 Bios version Insyde H20 180 i already try change the controller From ACHI to Compatibility mode at first few time is work well but now can't boot up again. & at the bios some time can detect HDD some time can't.