Hi , I've got an 550W ATX PC power supply and I changed it like this: [reprap.org]. If I turn on the heated bed on RAMPS 1.4 the PSU is turn off, and this is the same problem if I connect it directly to the PSU. My question is what is the reason, why is this happens? The PSU can provide 22A on the 12V rail. Everything works fine just the heated bed turns off the PSU. I don't know what need to do, i hope anyone offer some advice?
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