Using Command-Option-P-R keys the screen is gone black
I have used the Command-Option-P-R keys for resetting the PRAM but now the screen is black and can here the start up sound.
Please help me to slve this probem. I have changed the battery of the logic board but did not find any joy.
Thank you in advance for your assistance.
Original OS:
- Mac OS 10.6.7 Snow Leopard
Model:
- iMac (21.5-inch, Mid 2011)
Codename:
- No codename assigned.
Build Country:
- This unit was built in China
Build Year:
- This unit was built in the second half of 2012.
Build Week
- Week 5 (January) or week 32 (July)
Read here > Resolve startup issues and perform disk maintenance with Disk Utility and fsck
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Excerpt from
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http://codereview.chromium.org/273032
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