IMac doesn't work after last software update

After last Apple software update (new Safari and security stuff), my iMac 20"/2GHz enters in an on/off loop. It starts but it doesn't manage to load the OS, it shuts off, it restarts, it shuts off and so on.
Does anybody have the same problem?
Thks

Was your update download interrupted in any way? if so, then the computer is trying to find the downloaded files and because the download wasn't completed then it's causing the loop. That's exactly what happened to me. My computer was shutting off intermittent and it did on an update download, so it caused a loop at that's now your case, then never mind.

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Welcome to Apple Discussions, Freepisces
I have all the latest updates on my Macs, and I have no problem at all.
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IMac doesn't work after last software update

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