DV9543CL wont boot or let me do anything just black screen

PLEASE HELP ME
i was flashing my bios like hp told me to and while i was flashing my bios i got the blue screen of death  and now my computer will DO NOTHING not even boot all the lights come on and stay on bu the hard drive light will not flash or do nothing i tried a different hard drive and same thing nothing happens hp wont do anything about it because its not in warranty and it was there fault

Try this, disconnect AC power and all peripherals, remove the main battery, hold the power button down for 15 seconds, connect AC power and Not the battery, see if it will boot now.

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