@robertosburn First of all thanks for give me a time and answer my question. 1. tested and not working 2. AC adapter is ok. it turned on my other laptop. and also the other AC adapter could not turn on this gateway. 3. this is not display issue. it has charge indicator LED and when connected to AC and put the battery in place it should be turn on but its not. 4. when i tried to check the voltages with multi meter RAM and the other parts takes apart for about 10 minutes and put them back to their slot not working either. any advice about Motherboard problem for me? thanks in advance.