IMac DV green light on start button lights for a second then nothing!

Hi All,
My iMac DVSE 400 will not start up. When I unplug and replug power wire on back of iMac while in it is plugged into the wall socket..nothing happens, When I simply unplug from the wall sockect, the light in the on-off button turns green for a second or two...then nothing. Can you help me to diagnose and repair. Thanks.
iMac DV SE 400, 1 GB RAM, 128GB HD Mac OS X (10.4.3) Hope to get help!

I would suggest a PRAM reset. Immediately after pressing the power button, hold down the following keys; commandoption+PR. Let it chime three time, then release the keys.
Hope it helps,
Rick

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That's what I figured...thx!

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Make an appointment at an Apple store if there is one nearby.

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Impossible, there are zero, as in none, zip, nadda viruses for OS X. If you have viruses on it they are for MS Windows and will not affect OS X. I suspect the hard disk has crashed, if you have backup then it's not a big deal to have it changed, just take it into your local Apple Store or AASP for service. If you have not been backing it up you may be in for a painful lesson on why backup is critical.

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From previous experience 3 indicates a shutdown initiated by the SMC (System Management Controller) — hardware responsible for many low-level functions including power, sleep, lights, and fan activity.
Try resetting it:
Power or other problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset. Read all the steps.
Before Resetting the SMC
Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.

I have a MacBook Pro. My mac can detect wifi. But will not connect. I did get connected vis TCP/IP settings but I can't connect to any wifi anywhere. Network diagnostic has a green light for wi-fi and wi-fi settings. Red light for the rest.

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Hello NotAppleSavy,
Thanks for the question. After reviewing your post, it sounds like the computer wont connect to networks. I see you have used network diagnostic. I would recommend that you read this article, there are a lot of other things you can do in this article that may be able to help you resolve or isolate the issue.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
Thanks for using Apple Support Communities.
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Do these
https://support.apple.com/kb/HT3964
http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html
https://support.apple.com/kb/TS1713
https://support.apple.com/kb/ht1509
could be the power isn't sufficient, use another location
make a note of any results you get and post them

I am using apple iPod-suffle model and I am unable to upload music into iPod and 3 lights(green,orange and red) keeps blinking for few seconds when I connect my iPod to my PC and after few seconds its turn to unresponce mode,Plz help to find out solution

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Try:
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- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
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- Try on another computer
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Help me - iPod Shuffle 4th gen is probably dead - red light for 5 seconds

Hello,
sorry for my bad english. I hope you can help me.
I have iPod Shuffle 4th gen. I have it for one year. When I today tried to charge it, after connected to my PC (in the right USB port) I heard sound of connecting device but in Windows in My Computer nothing happened. On the iPod the diode emitted the red light for 5 seconds and then turned off. I have iTunes and iTunes doesn't recognize the iPod too.
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Hey StatistaXS,
Welcome to the Apple Support Communities! It sounds like your iPod shuffle may have had a very low charge when connecting to your computer:
iPod shuffle: Checking the battery charge - Apple Support
http://support.apple.com/en-us/HT1510
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http://support.apple.com/en-us/TS1412
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Always need Disconnect power, press the power button wait for 10 seconds...

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In english version the article is here:
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Power supply light is on or flashes
Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure:
CAUTION:This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.
Disconnect everything from the computer, including the power cord.
With the power cord disconnected , press the power button on the front of the computer and wait for ten seconds.
This is work for me. But now, my computer always need this methond that it can be started up.
Disconnect power -> press the power button and wait for ten seconds -> then the system will start up
So my question: where is the problem? Which part is broken and i should replace? Thanks.
regards,
Youli
This question was solved.
View Solution.

Hello youlichika,
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 you are not able to power on your desktop, and I would be happy to assist you in this endeavor!
In following the document for Troubleshooting Power Supply Issues, were you able to follow steps 3-9? If so, what were the results?
If you have come to the end of the document, and you still have to drain the power from the computer to power it on, you can find a replacement part (5188-2627) through one of the sites available by following this link.
I hope this helps!
Best Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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Choose the method for:
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Genius Bar reservation:
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http://support.apple.com/kb/ht3964
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IMac DV green light on start button lights for a second then nothing!

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