Hi,
I'm quite interested in the spec of your graphics card - I'd heard that all of the AMD 'R' series cards weren't working with VESA mode 103, which is required to show the bios of the T3500.
Did you simply not bother with the bios? I know that mine resets every now and then, which is why I'm not too keen to just throw another card in without having a backup. (I'm honsetly not sure why, but a few times I've ended up with the drive configuration changing, leaving me with an endless reboot loop)
If the 560 works on boot, I'm going to purchase one (or a 570... 580?) tomorrow!