Black screen. External monitor working
The Mac starts up and runs probably on thunderbolt to vga adapter but the built in screen remains black. It has an AMD HD 6770m graphics card so not the one under the repair program.
Any ideas what could be the problem?
Is this a good question?
4 Comments
To be clear here: You are able to run your system via an external monitor - correct?
by Dan
Can you give us the last four digits of your serial number so we can identify which model you have.
by Dan
Yes the external monitor works.
DHJP
by lcrooks
iMac 27" 2.7 GHz i5 (Mid-2011)
by Dan