Apparently this is a serious problem, with causes difficult to pinpoint. You may find some guidance in this Apple discussion: https://discussions.apple.com/thread/247...
Sounds like the screws are stripped. You may want to try some of these tricks to remove them: What are your tips/tricks for removing or extracting stripped screws?
No, it doesn't appear that you can repurpose an old 24" iMac as a screen for your Mac Mini. The iMac only has Firewire and USB connections, which won't allow your Mini to truly make use of the built-in screen in the iMac. See this Apple discussion for more info: https://discussions.apple.com/message/59... Newer iMacs allow this, through the thunderbolt connection, but not the older computers...
Check out the instructions for opening the iPhone 5 here: Замена дисплейного модуля iPhone 5 There are several steps you'll need to do before completely removing the screen, As the above guide notes in Step 5, "Do not try to completely remove the front panel assembly from the rear case, as there are several ribbon cables still attached at the top of the iPhone."
If the proximity sensor still isn't working, you may need to replace the power button and sensor. While you've got it open you may want to replace the vibrator with a brand new one. iFixit has them for only $9.95
As the Battery Replacement guide states: "To reassemble your device, follow these directions in reverse and use our iPad 2 Wi-Fi Front Panel Adhesive strips guide to reattach the front panel."
The iPod Touch 4G uses Toshiba NAND flash drive memory for data storage, and accessing this (by taking it out and putting it into a working iPod Touch, for example) is almost impossibly difficult. For more info you can check out the teardown, or perhaps this answer: Toshiba NAND Flash Memory - one or two chips?
According to Apple: "This may happen if the device unexpectedly disconnects during the update or restore or iTunes couldn't tell the device to go to the restore state." Check out the following page for suggested next steps (or you just might skip ahead to trying a different USB cable): http://support.apple.com/kb/TS5314
I accidentally pulled out the logic board socket when re-disconnecting the battery at this step. I came here from the iPhone 6 Battery Replacement page, where the disconnect step has this warning: “Take care to only pry up on the battery connector, and not the socket on the logic board. If you pry up on the logic board socket, you may break the connector entirely.“ I suggest adding that warning here as well, though it’s entirely my fault that I got sloppy.
And lucky, as the battery connection appears to be OK.
I guess this is where I lost the screen. In any event... the power button now works, and I have sound, but no picture. I can't even punch in my PIN to reformat the phone and give it away.
I accidentally pulled out the logic board socket when re-disconnecting the battery at this step. I came here from the iPhone 6 Battery Replacement page, where the disconnect step has this warning: “Take care to only pry up on the battery connector, and not the socket on the logic board. If you pry up on the logic board socket, you may break the connector entirely.“ I suggest adding that warning here as well, though it’s entirely my fault that I got sloppy.
And lucky, as the battery connection appears to be OK.
Btw, this was written in the comments for the 4S Power Button and Sensor Replacement, so if you see it anywhere else, caveat lector
I guess this is where I lost the screen. In any event... the power button now works, and I have sound, but no picture. I can't even punch in my PIN to reformat the phone and give it away.