I have been given a Toshiba Satellite L500 laptop to repair. The fault is that the laptop will not turn on even if the laptop is plugged in. At present I am presumming a problem with the DC power jack. I wasn't given the power adapter with the laptop so I am using another adapter which I know is working as it works on another Toshiba I have at home. I will strip the laptop down and check the DC jack. My question is are they repairable or is it better just to replace the jack.