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  • Hp8570w having os installed, keyboard some keys not, working, last time after some months, it started display with bios date and time wrong, because of no battery connected and with a vertical blue line in the left side of the screen and promoted to reboot for date and time correction. I restarted it, but this time, it is not showing anything in screen and stuck in the booting process by restarting again Bd again after some initialisation of processing. All led lights lights on, fan working, sound of system working coming, but failed to proceed without any display  please suggest and guide.
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