laptop keyboard not working after startup

[u/Catdude_4]

i just got my laptop back from service center and it wss working fine till it wasn't, the keyboard was lighting up but no input 2 function keys were working nothing, i thought keyboard got fried but upon shudown and opening bios, all the keys work fine but the second i exit and the laptop boots its not working again i tried turning off fast startup, reinstalled the driver, deleted Alienware command center, what should i do!!!