NIKHIL_8 :
my lenovo g500s laptop is sut down & when turn on it shows only lenovos logo & don't start windows
Does it go past the Lenovo screen at all? Any other details about how/when this happened? Did you drop it or anything?
Can you into the BIOS? Any beeps or lights? Try re-seating the RAM and hard drive, maybe try different RAM or one RAM stick at a time if you have more than one in there.