HP Laptop

Hp laptop if i type t it show bt5 and when i type y it shows ny6? Help

Hp laptop black screen caps lock light blinks twice slowly followed by 2 fast blinks. What is

If I press my HP laptop power button, sometimes it switch on only the notification lights, sometimes it on and when I input my password and start doing anything on it, It hangs for a moment and then switch off by itself, if I try to on it after this it won't switch on please help me