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Let me clarify before putting this to bed...

Power supply was wired correctly and plugged into the wall correctly. Sleepyhead then proceeded to plug into the controller board with polarity...

The board, Anet 1.0 took no damage. The stock power supply is dead. The power supply was replaced with another of slightly better output capability. The printer is running very well.

Greetings,

Having gone through the hardware check for the Alunar Prusa i3 that I purchased, problems arose with heating the bed and extruder.... they don't, either one. Everything else checks out...

Thank you Mjolinor.

My only hope now is that I didn't do other damage. I was working way to late and dog tired on my new project. Went to plug PS in to controller board.... reversed polarity......

I understand "nuts and bolts" but "amps and volts" evade me....

Power supply replacement... Can a 12V/20A/250W power supply be replaced with a 12V/30A/360W power supply? My guess is that the...