Dear Mr. Krabby,
I've checked this site for a response 5 times daily or more since I posted my iMac problem Saturday November1, 2008. Nothing as yet. I'd like some advice, please, if you're willing to share. Have already taken my iMac in for repair which I've been told is the power source. I've got no knowledge base- could you please help. In addition, "guest" has the same problem. You could get a two-fer if you're so inclined. :)
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Sounds like main board fault. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Check its main and sub power supply reguator section boards. If any one among this has the fault, the set won't switch ON. With this very brief detail you've given here, it is not possible to post a solution to your problem. Anyway, visit this site, and check whether there is something to help you. Visit the site named 'Electro-help' for
more details. Click this link. View it in
"Timeslide" option, which can be selected from the drop down box
menu by the [Sidebar] tag, at the top left corner of the display
window. It will make search easy. There
are more than 1000 posts to different brand TVs now. Pull up older posts there.
Visit the site named 'Electro-help' for more
details. Check this link and select the
site named above. View it in 'Flip card' option, which can be
selected from the drop down box menu by the [Sidebar] tag, at the left top left
corner of the display window. It will make search easy. Some times, the ads
attached with each posts both at the right and bottom, might help you to find
the availability of spare parts. There are more than 640 posts to different
brand TVs now. Will be updated daily. Faults and blinking codes; locating faulty board etc are described in detail. Pull up older posts there. You can narrow down the search for the faulty board.
Normally 6 blinks indicates Driver SOS 1 SU / SD / SC Boards
(SC energy recovery circuit)
This is usually due to the BIOS/Clock/CMOS battery dying. If the battery is dead, it won't start up at all.
Check out YouTube for instructions on opening your model, and replacement batteries are available at just about any Radio Shack, or online at various places. These guys may have them, too: http://www.headgapstore.com/
First, you should make sure you you have power to the iMac. Next if you checked you don't have power the iMac and you do, you could bring it to an Apple Store near you so they can diagnose it. Note, " I pretty sure they could diagnose it." Then if they know what the problem is, you could buy the parts needed from sites that have them and replace the faulty parts. You might be able to find how to replace the parts on www.iFixit.com. If this isn't what you are looking for you should probably clarify your qustion because the question has tons of possibilities. Hopefully this can help!!!!
Note: The Apple Store people might be able to fix the iMac for a price.
As soon as power is switched on, mains via the UPS, the LED glows indicating that the MB is ready for action, plus an indication that the SMPS, internal power supply, responsible for converting the AC to DC(12V, 5 V & 3.3 V, both(+ve & -ve), IS working for the MB(3.3V supply to the MB) & the MB has successfully passed POST(only MB), ready for action. I hope this is your query, else clarify the problem you are facing by posting it as a comment and I'll modify(try) the soln...........sodeep
Next time for any older model Apple portables including the MacMINI that no longer has its AppleCare has major issues and need to be fixed, and you have a small knowledge of how to follow instructions and use a screw driver then you should go to ifixit.com. They have the part that you would need and as a bonus to you when you order from them is they send you the how to remove old and replace with new. Step by Step with precise information and so you don't get totally lost in type there is an image to each step. The person who made that site sure did do a great and helpful job. And the instructions to do any of the jobs that is needed is given to all for FREE. You don't need to buy anything from them or give them any info for the free info. ((this is for anyone that might think i am punting for them-which i am-and they don't know i am)) < and i don't get squat from em but the same information you get >
Okay, you probably need a new power supply, this unit had many power supply and logic board problems. 300.00 is a lot for a power supply, 120.00 is the usual cost plus 50.00 labour, and that is canadian dollars, it should be much cheaper if you are in the U.S.