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heat bed just stoped working :S (no replies)

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OMG HELP PLEASE !!!!!

I have no power at heatbed.
I was succesfully printing items for last two days and without warning something went wrong.
My electronic is Sanguinololu 1284p with Marlin firmware.

Power supply is PC power unit giving out 12v @ 15 amps

Printing well and very pleased with my Prusa i2 and then lost power to my heatbed. After hours of testing I found a short in the wire from my electronics and my heatbed which I have now corrected. Tested power from my boaurd and was getting 11.7v reading until I connected the heatbed then power just stopped.

So fault on heatbed.... Got new bed with LEDS already fitted.... No power...
So to test the bed i connected this directly to the 12v power supply and it heats up like a dream.

Also if I set my temp for the bed to 60c in pronterface and click set the bed stays powerless but my hotend heats up until it reatches max temp set in fireware.

Am lost anybody have a clue whats wrong..... I would be most greatful for help....

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