iMac cycling on and off
hi my 2008 20" i mac intel 2.66mz with 4mb ram and 500 gb hard drive refuses to run.
It carried out an automatic update a couple of weeks ago, then just kept switching itself on and off every few seconds. I have disconnected the power a lot of times for between 15 seconds and 12 hours to try ALL the different start/troubleshooting commands that I could find listed without any success so I then swapped the hard drive for a second hand one + password and the mac started using the password I got with the hard drive with previous disc owners data on it. When attempting reinstall of osx using the recovery command the install finished but my imac now has the same cycling on and off problem as before. The disc will not format or even wipe using Dban . Any advice please.
Is this a good question?