I have a Windows 7 desktop. Recently received error message "excessive environmental temperature". Cleaned out a couple of years of dust. Removed CPU heatsink blew out and reinstalled thermal compound and replaced heatsink and fan. Rebooted and no overheat message, but now Bios does not recognize dvd drive or the HDD. I removed dvd drive and tried in another pc and works fine. I even installed a new hard drive, same problem. I only receive this message: Reboot and select proper Boot device or insert boot media in selected boot device and press any key" Ive unplugged and reinserted SATA plugs on both drives with nothing new Any suggestions would be greatly appreciated.