Right but were you able to restart while holding the Shift key? Hold the power button for 10 seconds to shut off then try starting and holding the Shift key
OK and you are using a wired mouse?
1. Shut down the computer. 2. Unplug the computer's power cord. 3. Wait fifteen seconds. 4. Attach the computer's power cord. 5. Wait five seconds, then press the power button to turn on the computer. 6. Press and hold the Command-Option-P-R keys before the gray screen appears. 7. Hold the keys down until the computer restarts. 8. Release the keys.
If you are outside the USA it will be ALT
OK try this:
Reboot into the Recovery HD by choosing the ‘Apple‘ menu > Restart, then hold down the ‘Command’ + R’ keys on the keyboard during the start up process. When you see the Apple Logo you can let go. When the machine boots you may have to choose your language then you will see the OS X Utilities screen. Select the Disk Utility and then select Continue. Then in Disk Utility select Macintosh HD in the left column (if there are two with that name or it is named something else choose the first indented item) and then select Verify Disk on the right. If that says “OK” in green type then select Repair Disk Permissions. If it is not ok let me know.
You are using a wired USB mouse and keyboard right?
When you did the procedure and held the 4 keys did it restart again?
Are they both Apple devices mouse and keyboard?
If you are at the Utilities screen unplug the mouse and plug it into a different USB port
OK so you never completed these steps?
1. Shut down the computer.2. Unplug the computer's power cord.3. Wait fifteen seconds.4. Attach the computer's power cord.5. Wait five seconds, then press the power button to turn on the computer.6. Press and hold the Command-Option-P-R keys before the gray screen appears.7. Hold the keys down until the computer restarts.8. Release the keys.
At step 7 let it restart 3 times
OK you said it went straight to Utilities screen I was confused
Do you know the system version it was running?
We can try booting from a USB stick but if this is a hardware problem it may still not work. It is strange that it works somtimes but not to Continue??
Go to System Preferences / Accessibility / Mouse & Trackpad and uncheck everything there
We of course have to get into it first
It may be the System Preferences but we need to get to that. Did you try right clicking on Continue? I made an offer for the 10.10.4 USB image too
Or arrows and then hit Return or Enter when on Continue.
OK and you are sure it restarted 3 times on step 7 above correct?
OK then I think there is a hardware failure of some kind, sorry.
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