566967, RE: Computer won't boot with second HDD attached Posted by KJT, Tue Jul-06-21 10:37 PM
Try pressing F8 at bootup to see if the "Advanced Boot Options screen" will open, If so, select the correct drive - the new one in your new computer.
If your Optiplex bootup screen is a Dell graphic, you will have to go into the BIOS/UEFI and change the boot up setting to information and not the graphic.
I hope it's this simple. Good luck.
OR, maybe, try connecting the old drive after you already have the Optiplex up and running.
Jim.
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