If you can't boot from the LiveCD you have a hardware issue (or a bad CD, but I doubt that's the problem). Assuming the disk is good, all your system needs is the bios to know your hardware and then for it to load from CD. Did you move the CD up in the bios listing of devices so it tries to load from CD and NOT from the HDD? If not, try doing that (hit ESC, F12, F2, whatever your Acer screen says when it pops up). If that still doesn't work then you have an issue with either the bios or motherboard or another piece of hardware. Is this an older machine that could possibly have a dead CMOS battery?