i have a hp pavilion dv7 laptop which was working perfectly ..but yesterday when i restarted my laptop it does not boot and says hard disk not detected ... I read somewhere that changing disk controller setting from AHCI to IDE might work but my laptop run on INSYDEH2O bios which has no such option ...i cannot update my bios as hp site offer bios with winflash which runs on windows . i have an important presentation to submit by sunday which is on my hard disk .. im running vista -64bit PLEASE HELP .!!!!