I have this all-in-one Acer Aspire 5600U and recently I've had issues where the computer simply won't turn on - the display flashes black for a bit and then turns back off.
There's no POST or anything on the display (no beep either), but the system power LED turns on and the fans and the DVD drive all start spinning.
Removing the RAM causes the motherboard to start beeping, so I don't think the motherboard is completely dead either.
The odd part is that I've found that recently just plugging the computer in turns on the system. And even more odd is that occasionally (after the system is off for a while), the system does sometimes fully boot if plugged in this way with the POST screen and beep. Perhaps something is wrong with the PSU? I'm not sure since it seems that the motherboard is powered if the fans and the DVD drive start to spin.
Here's some system details that I was able to get from running ubuntu (from a flash drive since I removed the Windows HDD) - https://gist.githubusercontent.com/robot56/d3fcca1880968d4efd3af1b69a47dffc/raw/. Everything functions including the speakers, bluetooth and networking so it can't be the IGPU/CPU/RAM, at least I don't think. Ubuntu did report some errors when it booted which I've attached in the image.
Edited by extremeheat, 16 June 2017 - 06:08 PM.