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Mine did that and it turned out to be a bad memory...I replaced it and it seems fine now, Marq. I ran tests and two out of three showed bad memory, but the third showed it to be good. I finally took it to a genius bar, 3 hr drive away, and they didn't think it was that, but pulled the memory and it ran fine, so they told me to order new memory and replace it. That cost me one cent for diagnosis. It had had a new PS earlier and I thought it might be that, but it wasn't.<div><br></div><div>Pat<br><div><div>On Sep 16, 2009, at 2:08 PM, Marq Speck wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; ">Cool - I just successfully replaced the power supply on my G5 iMac after it began repeatedly starting & rebooting endlessly.<div><div><br></div><div>One repair place said it sounded like a hard drive so I put in a new known good drive and for 15 minutes - no reboots. Thought it was fixed but then...</div><div><br></div><div>smoking hot PS and complete shut down of the machine.</div><div>Rats. Took a chance ordering a replacement PS and so far, the old drive and the new PS are playing well together.</div><div>10 hours & counting.</div><div><br></div><div>Have a great day and thanks for coming back online.</div><div>Marq Speck</div></div></span></blockquote></div><br></div></body></html>