Acer Aspire 5749 automatically shutting down after 3 seconds of loading a Live CD

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http://www.linuxquestions.org – I screwed up my grub.cfg somehow on my Arch box, and I needed a LiveCD to quickly swab it with a backup I had ready. I had a Backtrack 5 DVD lying around and tried to pop it in. However, I've had a similar problem with it; it won't boot. It gets to the screen where you select the boot mode in a list, memtest, live cd, install, whatever. It always counts down approximately 3 seconds, then my computer turns off immediately without warning. It's not the DVD because it works fine on my desktop and I double checked the hashes. This kept happening, no matter what I fiddled around with in my BIOS. I (HowTos)