iPad will not boot or restoreI have recently received a dead iPad 4, The issue was that it would display the low battery logo and the little picture of...
"iPhone Screen Went Black"に関する回答If you have any tools and are willing to open up your phone, you could try removing the battery and reinserting in after 10 minutes or so (act as a reset). Follow iFixit's battery replacement guide to remove the battery
"unable to dictate messages or request to Siri"に関する回答Does the microphone work in other apps (Camera or Voice Recorder) If it does then you may want tor try first resetting all settings (Settings-General-Reset-Reset All Settings) (This does not delete any data). If that does not work you may want to try restoring in iTunes. If the microphone does not work in other apps you may need to replace the microphone (A reset all settings and/or restore may also work)
"Fresh Install - Screen Goes Black and Never Returns"に関する回答I am by no means an expert on iMacs but from experience this is most likely the GPU. It works fine until OS X loads the drivers at which point it fails. You can usually test this by booting the iMac into safe mode (Hold SHIFT on startup until you see the apple logo) The machine should boot fine. If it is the GPU you may need to reflow the GPU.