there's no telling what could be the culprit after treating a desktop roughly or moving it around that way.
devices unseated; CPU, RAM, PCIe\extension cards, battery, etc
cables knocked loose; PSU, front panel, etc
humidity damage
physical shocks causing hardware damage
if it's just an unseated device\cable;
the entire system may need to be disassembled and reconfigured to find the culprit.
a major system device may be damaged that would have to be replaced.
the best way to troubleshoot devices is to have a functioning compatible secondary system to test each piece of hardware in one at a time.