So I have an older iMac (5yrs old or so) with leopard. Anyways I restarted my comp cause it was freezing up and then I kept getting the white screem and it would never boot. So I found out how to add the install disk and boot it. Then I used my time machine to reinstall. I went to bed and then this morning my computer was on a grey screen and it says "You need to restart your computer. Hold down the Power button for several seconds or press the Restart button" So I did. and it keeps coming up. Now what do I do?