I have Downgraded my bios from A22 To A03 , it successfully downgraded with no issue but i have powered on my laptop , disabled nvidia optimus , changed Sata operation from RAID To AHCI after i have applied settings , exit Bios my laptop power on but not posting any thing i have powered off my laptop and tried to power on with fn button pressed my laptop powered on to Diagnostics i have exited it and pressed F12 Button on boot choosed windows 10 from boot menu but nothing appeared on the screen only screen leds on i have restarted my laptop , entered bios , Loaded Defaults and exited bios . my laptop powered off and powered on again with no post i have powered off and on again with fn pressed nothing happened my laptop was powered on for a while and powered off with hard disk led blinking and wifi,chrager leds solid with power button led off. Is processor has been failed?

How i can fix it?