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Verify the UPS.<div><br class="webkit-block-placeholder"></div><div>I would first pull the plug on the UPS to see if that caused the shut down. I have had them go bad. Then when they sense a power failure (that you may not even notice) it switches to battery but there may be no battery power available, thus the shut down. Then check the power switch and power connections.</div><div><br class="webkit-block-placeholder"></div><div>Ron--</div><div><div><div><br></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: Tahoma; font-size: 13px; 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: 0; ">> Has anyone experienced this phenomenon, there is no apparent reason<span class="Apple-converted-space"> </span><br>> and I can restart immediately. I'm on a UPS so there is no general PF<span class="Apple-converted-space"> </span><br>> and the screen has power from the G4 the whole time. The machine just<span class="Apple-converted-space"> </span><br>> switches off, no shut down, no warnig, just zapp!</span></blockquote></div><br></div></body></html>