Computer stops showing images after Booting

Hey all,

My friend just built me a new computer and it was working fine when I took it from his house to mine (The drive is about 2 hours so, if I can I'd like to figure this out on my own).

When I got home I plugged the computer into my television (which has VGA and HDMI inputs) using my computers component output. I switched my TV to the HD setting and my computer begins to boot up and I can see the window's XP loading bar, but no sooner does it complete than my screen goes black and the TV says no signal. I tried using the VGA and HDMI inputs and the same thing happens. What can I do to trouble shoot this problem?

Thank you in advance!