First off, please excuse as this may be a 'stupid' question as I have little electronic knowledge. I have an AOC monitor and have just worked out the power supply is faulty. It is a 12V, 3amp transformer. I have been given one to try that is 12V, 2.8amps and the monitor works fine. I cannot keep this one and was wondering if a 12V, 5amp transformer would be OK. I'm just not sure how critical the amp rating is. Any help would be appreciated. Thankls