Hello everyone, i ve found an old lenovo thinkpad x201 but i can t find his power supply. I ve a lot of other brands laptop power supplies. The x201 dc connector has 5 little cables running to the mainboard: 2 reds, 1 blue and a 2 blacks that i assume are ground cable. 1 of the black ones is plugged with a screws to the chassis. My question is: if i use iron soldering to put togheter the red ones can i use a power supplies that only got 2 cables (without the ground)? Or i m going to brick the mainboard?