The plot thickens! I realised that I have a disk in the PC that has an old image of my system ( I upgraded the disc ...6 months ago - added a new C: drive ) What it is doing is (seemingly ) randomly booting from one of the two two discs. I decided to format the old disc and now the PC randomly goes to the next boot device - the DVD and gives me a message "re-boot and select proper boot device or insert boot media in selected boot device"
Could this be a disc problem ? Bios ? No other changes have been made and it has been working fine until a week ago. I went as far as re-install Windows 7, all of the updates, all of my apps, downloaded all the latest drivers
etc and it still does it from time to time. Last night, it would not 'revert' so I rebooted and checked the boot device order- it was set to DVD 1st, I re set it to the disc with the OS and it booted fine.
If there was a problem with the the HDD, I guess it would try the next boot device ? Or could BIOS be faulty and just re-arranging the boot device order ?
I'm a bit of a newbie to all this so any advice gratefully recieved !