<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Have you tried booting from a known good system? Such as a DVD or ext firewire drive.<br><div><br></div><div><br></div><div><br><div><br></div><div><br><div><div>On Dec 11, 2008, at 1:27 PM, Mark Steele wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">This is a dual 1.25GHz MDD G4 (I think it has FW800, not sure, how to tell???)<br>1.25 Gigs RAM.<br>Couple of HDs and two internal optical drives.<br><br>Problem: When booting into OS X (10.5.x) the machine locks up at the grey screen with the Apple logo.<br> Booting into the Hardware test disk (supplied with the machine) works fine and all tests pass, even letting<br>it loop overnight.<br>Booting, installing and running linux does work (but can be somewhat flakey) The ones I've tried are<br> Fedora 7(?), some version of Ubuntu (which doesn't seem to be supported with the latest version so<br>it is probably one back from that).<br><br>I've re-arraged the RAM chips (using the same slots as before) and the problem still exists. Any attempts<br> to boot into OS X fails. This machine has had the same hardware for several years and booted and worked<br>just fine, then one day it just locked up and wouldn't boot again.<br><br>Any ideas on what to try next??<br> Thanks,<br><font color="#888888"> -Mark</font> _______________________________________________<br>G4 mailing list<br><a href="mailto:G4@listserver.themacintoshguy.com">G4@listserver.themacintoshguy.com</a><br>http://listserver.themacintoshguy.com/mailman/listinfo/g4</blockquote></div><br></div></div></body></html>