.my bios and boot menu not opening even f2 and f12 key press it stuck on lenovo logo

[Dogabhai]

Lenovo g580 wont access bios and boot menu .when i press f2 and f12 key it say please wait then nothing happens just black screen.Stuck on lenovo logo.
Tried changing cmos

 

[VirtualLarry]

Does it have a tiny recessed "Nova" button? Looks kind of like a router reset pin-hole button. Try using that button to power-on, rather than the normal power switch. Should get you to the BIOS.

 

[Dogabhai]

Novo button is there but not working

 

[VirtualLarry]

Novo button is there but not working

You use the Novo button, when the system is powered OFF.