Why are all the code lights flashing all the way around continuously

Ok well my hp 2000 laptop was working fine one minet then when i hooked it back up to the monitor i have been using as a bigger screen for my laptop, i did what i always did plugged in the blue monitor plug that goes from comp, to monitor. and hit function and f4 to switch from laptop screen to monitor screen and that's when my laptop went all blinky on me. it shut off and when i tried to turn it back on all the code lights started blinking all the way around continually. i tried taking out battery and plugging it in then power on still the same thing happen i tried hard reset didn't work. i'm at my wits end please help...

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