re: Computer wont boot.. if it does, it freezes. Updated ***

Take windows out of the equation completely. Unplug your storage drives. Anything you don't need in order to run low-level hardware diagnostics from a boot disk/usb, should not be connected. Including all front panel headers. If you aren't stripping the computer bare and adding components back one at a time, you're doing it wrong. Go borrow someone's computer to create an Ubuntu live disk.

Oh, and low/dead CMOS battery would not be a direct cause of this. That's silly. All that would do is constantly warn him that CMOS needs to be setup again, time and date wrong, etc.

If Ubuntu works perfect (WITH HARD DRIVE AND ALL OTHER NONESSENTIALS UNPLUGGED) for a while, post is hanging on initializing a hard disk and barely booting when it can find your OS partition. Odds are, a reinstall won't fix that. If you can't even stay stable long enough to frick around in Ubuntu, replace your motherboard.