2 year old dell 1150 shut down on it's own and now there is no power lights and no response from the power button - problem has been diagnosed as a motherboard by online support - dell wants $4450 to ship and fix. I am doubtful that that is the problem and feel its more likely someting with the power supply.
AC power cord is good - tested with another unit.
Any suggestion to identify the issue/problem?
Thanks