Hello,
Its been so frustrating with this issue.
The bones were shown just perfectly until two days ago, its confusingly disappeared.

this is example 2

I am in the middle of doing my assignment, which makes me really really stressful.
I am using VAIO, with two switchable graphics card. They are AMD Radeon HD 6630M and Intel® HD Graphics 3000.
I dont think that my graphic couldnt handle the Maya because it worked really fine a few days ago.
Please, this is so irritating.
Thank you so much in advance.