I am trying to set-up my work bench at home and found an old Mini ATX power supply. I fooled it to power on and it does, even checked with a multimeter. My situation: I purchased a Mini ITX Carputer from ebay which already came prewired with an M2-ATX. I connected the power and switch wires together because I didn't have a switch at the time, hooked up the ground and what I notice is that the tiny green LED on the motherboard lights up for a second and then goes off. I thought the power supply wasn't powerful enough so I brought it to the car - hooked up black to ground and as soon as I connected the red wire (without white this time) to positive terminal, it "welded" itself to the terminal and the fuse on the M2-ATX blew. What am I doing wrong? I promise I searched
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M2-ATX Powering Issues