I used to run minecraft at full grapics now i can't?

Hi, i used to run minecraft at full graphics now i can't for some reason do i have to do something? Please help!

My current laptop

Lenovo G570

i5 and Radeon graphics card 6370M

My guess with that little detail is that you installed a new graphics/video driver and your graphics card is no longer kicking in. A lot of the Lenovos have both hd integrated and a graphics card, if the card isn't firing you will have issues.

Have you restarted your computer lately?