I downgrad my iphone from ios5 to ios 4.3.3 and after restoring the ios 4.3.3 i fixed all itunes error but after that my i phone screen turned off and the apple logo didnt shows up any more what ever i did my iphone model 4 gsm

i downgrad my iphone from ios5 to ios 4.3.3 and after restoring the ios 4.3.3 i fixed all itunes error but after that my i phone screen turned off and the apple logo didnt shows up any more what ever i did my iphone model 4 gsm and fyi i try all the ways to turn it on but it didnt sucsses

roaminggnome
thanks for helping but i didnt know that is the downgrade is forbidden and i ask for help and u didnt help me so i just want to thank u for telling me that is the downgrade is forbidden >>> but now i didnt have i phone any more so thank u so much again >>>>

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There is a thread or two about the home button and how to fix it at least temporally. It sounds like some people have found it to be a rather permanent fix. Do search on something like "Home button won't work". It has something to do with putting the charging cable into the phone and applying a little extra pressure upward on the key. Don't take my word for it though look for the thread/s. You said originally that your "Power" button was broken and the thread I have seen is about the Home Button.

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my i phone keeps turning off and turning back on cant play games because it turns off in the middle

Which jailbreak are you using?

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Hey Angus97,
These are the recommended troubleshooting steps to take when you are unable to Slide to Unlock:
If the device is unresponsive or if certain controls aren't working as expected, restart your device.
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from: iOS: Not responding or does not turn on
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Welcome to Apple Support Communities!
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Hello hazelrose,
What an unfortunate situation! I'm sorry to hear that your current phone has stopped working. Let's see if we can find an option for you. What make & model phone do you have? Do you happen to have the extended warranty or insurance on your device?
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Follow us on Twitter @VZWSupport

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Did you also try to set it up as new device without using the backup afterwards?
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Apple - Support - Service Answer Center

When phone screen goes off and turned on the running app closes. Why ?

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I had the exact same problem today. Scheduled a Genius Bar appointment but this is bizarre that multiple people are having the same issue at the same time. Spooky, even.

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http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
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http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html
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Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad
iPhone, iPod, Using the iPad Charger
http://support.apple.com/kb/HT4327
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To Extend a Device’s Battery Life, Get to Know It Better
http://tinyurl.com/b67c7xz
iPad Battery Replacement
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HT201263 ipod touch cannot turn off or on apple logo flashes on and off

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Try:
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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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OK - I just found this and it seemed to work.
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I downgrad my iphone from ios5 to ios 4.3.3 and after restoring the ios 4.3.3 i fixed all itunes error but after that my i phone screen turned off and the apple logo didnt shows up any more what ever i did my iphone model 4 gsm

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