Question Attempting to upgrade an old Alienware (Please Help)

Feb 24, 2019
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Hey friends, I am having some trouble and seeking help. I recently upgraded my main system and so gave my old stuff to a relative. It's a Core i7 7700k, 32 gigs of RAM, and a ASUS ROG Maximus VIII Ranger, in the case of an Alienware D0X1. I noticed that the power supply was non interchangeable, but it worked previously so I thought nothing of it. Before moving back to it's usual space, I plugged it in, and it started fine. I moved it, and the motherboard started flashing q00 and would loop, it does this constantly with the new setup. I got a Powersupply tester, and a spare. Original test fine, as does the spare, but with the spare, it posts everytime. I am not sure what to do at this point, so I left the original equipment in and it's running fine. Any help would be appreciated. Thank you.