Just wanted to add that I too am suffering the same problem on a Acer Aspire 5742G-6600; I boot it up and it just hangs at the boot loader.
Free-BSD Boots and install's fine, but I'd much rather use PC-BSD
Not sure what is going on, are there any debugging options or such I can get some info from? It's hanging on something, (not freezing) since the one character slowly rotates.
I'll be happy to test the next snapshot when released.