I'm having a huge issue where when i power on my Lenovo G50-70 laptop, it will slowly boot up, flash the lenovo logo, turn black, and repeat the process infinitely. i have read in similar threads that all i need to do is enter safe mode but the issue is my laptop is refusing to register or acknowledge any of the keyboard command i input, whether it be ctrl+alt+dlt, windows+i, or f8. help would be extremely appreciated, as i need this running again asap!