"I have put both drives, one at a time, onto a spare comp but neither drive will boot up (both have an OS on them), windows tells me that it has closed down to protect my system and tells me to run CHKDSK. I have done this but no joy. The CMOS does detect the drives though."
Operating systems will boot when they have been installed to a disk resident on the PC. In other words a hard disk with an OS cannot be simply installed in a different MB and run.
I am sure in the world of computing there will be an exception someplace but I did my best to help here.
I would install an operating system on a hdd resident in a pc and then install one of your disks as the second one to view it, not to run the OS from it. I hope this helps out.
Operating systems will boot when they have been installed to a disk resident on the PC. In other words a hard disk with an OS cannot be simply installed in a different MB and run.
I am sure in the world of computing there will be an exception someplace but I did my best to help here.
I would install an operating system on a hdd resident in a pc and then install one of your disks as the second one to view it, not to run the OS from it. I hope this helps out.