Solved! My dell laptop shows password wrong even after entering right password..few days ago I opened it with the same password ...but

[meghnarai58]

Inspiron 15 3000 series

 

[BadAsAl]

Did you try with an external usb keyboard? You might have issues with the onboard keyboard and it is not entering the characters you think it is.
Beyond that, we can't help you with password issues if you are entering the password correctly and it isn't letting you in.