iMac's screen turned green and now won't boot
During use, also music froze... Now it goes past apple logo but then screen stays white and nothing happens.
still using Lion osx
iMac, Mac OS X (10.7.5), 3.4 Intel Core i7
Follow these steps:
- Shut down your Mac
- Wait until your computer turns off and after that press the Power button
- Right after you hear the startup tone, press and hold the Shift key
- Release the Shift key when you see a grey Apple sign and the progress bar below this sign
- Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)
- Click on Verify Disc and then, if asked to fix problems, on Repair Disk
- After this, click on Verify Disk Permissions and then on Repair Disk Permissions
- After the process is finished, shut down your Mac and turn it back on after about 30 seconds
Apart from that, take a look at this Apple article and follow the instructions on Resetting NVRAM shown there:How to Reset NVRAM on your Mac - Apple Support
If this does not help, follow the steps suggested by Apple in this article:
https://support.apple.com/en-us/HT204267
Hope this helps!