2006 iMac Desktop computer won't turn on?

     My Mac desktop computer from 2006 won't turn on. I tried unplugging it and re-trying and that didn't work. Does anyone know why this happens and how I can fix it?
     One time, we brought it in to the apple store and it turned on there so they didn't fix it. Sometimes it turns on randomly after a lot of tries, but now it hasn't turned on for a while. Usually we leave it on, but we had to turn it off because the power was about to go off.
     Thank you!!

Hopefully something here will cast some light:
iMac G5: Fails to startup
http://support.apple.com/kb/TS1989?viewlocale=en_US

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Hello Llenrn,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that your HP Omni 120-1132 Desktop PC is not starting correctly. I would like to direct your attention to the HP Support document: HP PCs - Computer Does Not Start (Windows 7), which has been designed to address numerous issues that could affect your computers boot process. Simply follow the steps contained within the document including additional documents that may be linked within.
Please re-post if you require additional support. Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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Quote from: PirateDog on 22-December-13, 03:02:06
As in Reply #1, keep that configuration and use the switch on the mainboard over to the other BIOS chip. For some reason, it sounds like the one chip may be corrupted or maybe the PSU has become faulty. Double check the security of the 24-pin and CPU power 8-pin connections.
Thanks for your help. I fixed the problem. I am a bit ashamed to say what was wrong but ... the 24 pin connector was loose on the psu side.
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2006 iMac Desktop computer won't turn on?

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