hello i am here to assist
can you please explain exactly what is going on is it a screen issue?
so you want to restart you mac in manufacterer settins as iff you just bought it ? im a correct?
im confused when you say a checked screen
ok give me one minute
this came up after you upgrade to which version
ok give me a secon pls
do you want to use your time machine
to reset your system
i am going to send you a link on how to rest your os
The next step would be to reinstall the operating system but booting to the Recovery Disk and reinstalling Lion to resolve the issue. The article below will assist with that process.
i will send the article momentarily
see if this helps i am still looking further for you and will not rest till you isssue is resolved
is that helpful?
please let me know if you require further assistance. My purpose is to help you until your problem has been solved. I thank you in advance for rating me as that is how i get credit for assisting you