Question my laptop keeps doing on and off

[Dumpymumpy]

my laptop keeps doing on and off and idk why. The laptop is still on, the battery is still charging, but the cylinder symbol thingy is off. My screen is just off and I don't know what to do. My laptop is windows 8 and I'm a student who needs to submit my research. Please help me asap. I don't know what to do..