I've just rebuilt my pc inside a new case and it's now running incredibly slow.

RYANoceros92

Honorable
Feb 18, 2015
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10,530
I've just rebuilt my pc inside a new case and it's now running incredibly slow and everything stops responding and freezes every few seconds, I've no idea what's wrong, any help would be great thanks.
 
Solution
Check Cpu temperatures.

You may not have reapplied the thermal paste correctly if you had to remove the cpu cooler.

If the system is many years old you may want to clean the remaining paste and apply new paste.
I would take everything apart and redo it all. Do you have a big air cooler on your cpu? Moving your Motherboard from one case to the other may have flexed the board and moved the cpu under the cooler, could have moved the ram. Check all the cables to make sure they are seated correctly.