Yes, rotate the z screw by hand - you will need to clean the grease off your fingers afterwards.
Also unplug the big powersupply until the blue light goes off (may be more than 5 minutes!) and then plug it back in. I think it might have a safety feature where once it detects an overload it stays off until a power reset.
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IRobertI 521
You can raise the bed by simply rotating the z-screw by hand, without power it will spin very easily.
As for what could've happened. No idea I'm afraid. Does anything turn on at all like the LED lights?
As a first step, and this may sound a little stupid, but make sure the power cable on the power supply is secure. I accidentally bumped my power supply the other day and it shut off the machine. The blue LED on the power supply still glowed (the filter caps in the supply probably had enough juice to keep it going) but the cable wasn't quite in there.
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