Did you make the new hard drive a slave to the first, or did you install it as a secondary drive? Whichever method you used, do the other method. Your PC seems to be getting confused and trying to boot the new drive. Possibly a resource conflict, so it's easiest to change it.
I do remember something like this happening to me years ago, and I used the other method to fix it. If this doesn't work, then it may be true that your primary is about to crash. If you have Windows on disk with the key to install it, then you can install your new drive as the master or primary and install windows on it. Enslave your current master to it and transfer critical files to it. You can then reverse the two drives if you like, but you'll have peace of mind that if you lose your primary, you can switch themm again.
If you decide to make both drives bootable, remember to change the jumper pin on the drives to be slave or master or seconsary, etc. depending on your drive and system configuration. In fact, you might check to see first that you have them jumped correctly now. This could be the source of the problem.
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