Toshiba C850 Getting stuck on startup logo

[Udara Umayanga]

Hello friends,
I have Toshiba C850 Laptop when it is power on it was stuck on Toshiba logo.
I was try to solve it but cant please help.
I was reset CMOS , remove hard drive , remove battery and change ram and I did many more things.. But nothing doing any thing Please help..


Thanks,
Udara