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Here's my input from many years of repairing thousands of computers:
Regarding putting the old drive in a new machine:
Sometimes putting the old drive in a new PC works and sometimes it doesn't.
It all depends what drivers from the old configuration are compatible with the new one. If enough of your old drivers are compatible with the new system to get the machine up and running enough to install the needed drivers to take you to 100% then you'll be fine. (remember to try booting in safe mode)
If not you will need to reinstall your OS.
Alternatively you could take the opportunity to get a squeaky clean new OS install going on and put your old drives in as additional ones, initially to pull you old data from and moving forward as extra storage.
Or even buy an external USB case so you can have easy access to any data you may need from them.
As far as the mobo not working, before you write it off, look very carefully with good lighting and make sure there is no dust or other crap present in the memory slots, also make triple sure any memory modules you inserted are inserted properly and completely.
Look under the mobo, between the mobo and the case and see if any screws or springs rolled in there.
Test each Dimm one by one, then two by two in every different slot and every combo you can think of. Do this patiently and carefully.
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