+ 0 Votes Difficult davidfacer February 8, 2013 at 7:27am PST Hi. These problems are difficult to analyze, far less fix. 1. I suggest strongly that you try booting from a CD such as Hirens Boot CD. Success in this would point to an O/S issue. Then run the memory checker off the Hirens CD. So many puter issues start and end with bad RAM. 2. Should your situation not improve, I suggest - if you can - to access the BIOS and disable the SATA controller completely, then reboot again with the Hirens CD. The SATA HDD controller is the first firmware to load in the post process. If you gain a successful boot here you will need to replace the motherboard, or simply not be able to utilize SATA. Best of luck!