Does it do that shutdown with an UBUNTU LiveCD? If so, arrange for repairs.
I wanted to reformat my laptop using a 64-bit windows 7 professional DVD, but everytime I boot it up after the installer loads and before it reaches the Installation GUI it automatically shuts down. I tried booting up my Kaspersky original CD since it has this Rescue Tools but as soon as it reaches the GUI my laptop shuts down. The reason I wanted to reformat my laptop was because a Trojan named " JS:ScriptIP-inf" infiltrated my laptop and after changing my antivirus to kaspersky internet security 2013 my laptop just became too slow that my commonly used programs and games now takes so much time before it could open.
My laptop is an MSI CX420, Core i5, 4GB RAM, 320GB HDD, ATI Mobility Radeon 5470 with 1GB dedicated memory