mh 1351 problems

[crow11 0]

hi all new to the forums but i have a major prob with my mh1351 only got it yesterday bought it second hand it was shown working at the time got it home was working come to do a first cut put the vinyl in set the blade went to cut it the screen went off but the fans still worked took the bottom off to have a look at the motherboard and power supply everything was plugged in ok,

after looking at the wires the fans will run anyway even if the power supply or mainboard went as they are connected directly to the 240v supply, had a tester on the outputs of the power supply and getting nothing at all to the outputs i noticed a green led on the power board which doesnt light up either checked both fuses all ok getting power to the big capacitor on the powersupply now i am stuck on with part to check in the supply lol, is there a common component what goes in the power supply as i am in the uk i cant seem to find anybody what does the parts over here,i know the basics about electronics but im no expert 1 theory i thought of was it would have to be 1 major component whats gone for it to not give any outputs out at all or i am guessing here lol could it be that a component as took the ground connection out and that is whay i get no output with my tester at all the outputs,my power supply as the following connections

live neutral earth ac 5v gnd -8v 18v gnd 36v i have put my tester on the both these gnd points but get no voltage to anything or am i total missing the point and the power supply recieves a signal from the motherbard to activate it if all this makes any sence cheers