To test RAM, download 'memtest' from versiontracker and run it. It will readily ID malfunctioning RAM or RAM that is out of spec. Some Macs are very picky about RAM psecs... Does the computer work properly when you remove the new part(s)? If so, that indicates that the fault is with the new equipment. HTH, jon Original Message: ----------------- From: Richard Kriss rmkriss at sbcglobal.net Date: Fri, 02 Feb 2007 17:59:44 -0600 To: g4 at listserver.themacintoshguy.com Subject: Re: [G4] G4 will not boot up after addung a 128 HD > Date: Sun, 28 Jan 2007 11:52:32 -0500 > From: Richard Klein <rich at richardklein.org> > Subject: Re: [G4] G4 will not boot up after addung a 128 HD > > Try the RAM in different slots, too. Sometimes the slots themselves can > stop working right. The main thing is to experiment with only one stick > of RAM at a time to narrow things down. I may have missed something in the first posting; however, I had the same problem the first time I changed HDs in my G4 AGP 1GHz. The fix was pretty easy. I did not have the ribbon cable seated. Just unplugged it and put it back in again. If something is not really connected, it will not start. Try reseating the cables.... the price is right and it cannot hurt. dick -------------------------------------------------------------------- mail2web.com Enhanced email for the mobile individual based on Microsoft® Exchange - http://link.mail2web.com/Personal/EnhancedEmail