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Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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Unit fails to power up

My unit fails to stay powered up. Comes on for a few seconds, then powers down. Then it doesn’t power up. This sequence occurs repeatedly.

Plugs and power leads have been changed.

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It does sound like your power supply is failing iMac G5/Intel Power Supply and here’s the guide you’ll need to follow iMac Intel 20" EMC 2105 and 2118 Power Supply Replacement

This series PSU’s might have defective electrolytic capacitors Capacitor Plague.

crwdns2886500:0Power supply for iMac G5 and iMac Intel 17" & 20". Compatible with 1.9 GHz 17" G5 iMacs (Excluding EMC No. 2124) 2.1 GHz 20" G5 iMacs All 17" Intel iMacs and 2 (EMC No. 2105), 2.16, or 2.33 GHz 20" Intel iMacs.crwdne2886500:0

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iMac G5/Intel Power Supply

$49.99

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Mel Ramsay crwdns2934231:0crwdne2934231:0
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