IMac freezes after turning on. Nothing happens. What should I do?

My iMac is able to start up, but it suddenly freezes on the apple logo with a white background. It stays like this for hours and nothing still happens. It's able to be turned off however but other than that, nothing.

Please carefully read Apple's Mac OS X: Gray screen appears during startup article. You can find it at:
http://support.apple.com/kb/ts2570
I suspect your machine may have suffered a hardware failure.
BTW when posting without a basic profile of your computer troubleshooting is difficult at best. If you don't know how to do a profile please click https://discussions.apple.com/docs/DOC-3602

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Try:
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Try:
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Hi tgoit2015,
If you are having issues restoring your iPhone, you may find the following article helpful:
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http://support.apple.com/kb/ht1808
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My ipod touch is showing the connect to itunes, however, when i plug it into the computer nothing happens, what can I do?

My Ipod Touch is telling me to connect to itunes, however when I do nothing happens, what can i do?

Try:
iOS: Device not recognized in iTunes for Windows
or
iPhone, iPad, iPod touch: Device not recognized in iTunes for Mac OS X
Also try:
- iOS: Not responding or does not turn on
- 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 iPod fully off, let the battery fully drain. After charging for an least an hour try the above again.
- If still not successful that indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

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http://support.apple.com/kb/ht1808
Regards,
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IMac freezes after turning on. Nothing happens. What should I do?

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