First, sorry for the lengthy post, but it is an odd issue and I want to report what I have all tried:
I have been struggling with this problem for a while and I am stumped. The issue is if I am running windows for a period of time (I've noticed approximately 1 hour or more causes it to screw up), if I select to reboot the computer from within windows, it fails to POST. I have updated the BIOS to the latest version provided by ACER as well as updated all drivers that I could (NOTE: acer had the wrong drivers on their webpage for the graphics card, but using the ones from AMD did not remedy my issue). I have done a full virus scan using Avast! antivirus as well as MalwareBytes Antimalware and the problem still exists.
My next step would be a full OS reinstall, but I am fairly confident that it is not an OS issue.
When it reboots, it goes through its normal shutdown cycle (USB loses power, video output stops, etc) and then it just sits there with the fans spinning and never comes back up. I have tried unplugging all USB devices (except either keyboard OR mouse) and the problem still exists. I have also tried running startup repair and it claims there are no problems.
I am running Windows 7 X64 with SP1. Hardware is all factory in an ACER AX3470. Acers website indicates that this computer should have an NVIDIA graphics card, but the stickers on the front state "AMD RADEON GRAPHICS" which is the same thing that Windows reports (I have contacted them about this and they told me that it had AMD chipset with NVIDIA graphics card). Other than this rebooting and not POSTing issue, the computer works great. The BIOS is set to use the default settings as was recommended during the BIOS update.
Any thoughts about what I can try apart from a full OS reinstall (I'm nervous to do that because a reboot is required and if the computer fails the reboot, I don't want to be stuck without a computer)?