i had problem like this.i was about to send to fix.so i took memory out.memory was out at the time.then friend of my say let me try it before u send . i try to turn on ,next thing it turn on & i see some thing on screen.then i try to put 1 memory (must be a good one) next thing i know it start boot up & i see screen was working fine.i try with both memory same problem. then i found out it was memory cause a problem. i hope this may help. small thing some time make a big problem