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Megatronics v2 problems

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I have an unbranded 240v 20Amp 12v powersupply and a Megatronics v2.0 kit: [www.amazon.co.uk]

Main problem:

My heatbed mosfet is getting ridiculously hot when the second 12v line is hooked up whether the heatbed is on or off. I put a small heatsink on it, but its still far too hot, burn your skin hot. The heatbed works but I wouldn't like to have it on for more than a few seconds. Does anyone know why that might be, if its a common problem or if it could be solved with a resistor or something simple like that? I've tried it both with a second 12 line and connected in parallel with the first 12v cable.

Is 20 Amps too much?

LCD problem:

I also can't get my LCD 12864 to work, the dial, the speaker and the light button work but the screen just flickers. I don't know if that could be a related issue. I have uncomment the line: #define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER

Does anyone have any idea I haven't been able to find much online about it at all.

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