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It looks like the 1.1 boards had a PSEL jumper to choose whether to power the board's 5v logic from the power supply or the USB, but this is absent on the 1.2 boards. I suggest unplugging the power supply inputs from the board and connecting the USB. This should power the board. If so, then use a volt meter to check to see if 5v is present at pin 1 of any of the following connectors: SPI, ICSP, I2C.If so, you can use this 5v for the relay power and pick up the signal in the PS_ON terminal beside the power inputs. DISCLAIMER: I have no experience using RAMBO boards. This information is provided from examining the schematic at http://reprap.org/mediawiki/images/9/91/Rambo1-2-schematic.pngProceed at YOUR OWN RISK!
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