Windows will not load up

Hi everyone, so to explain my problem :
I was surfing trought web when my pc started to use more memory like normaly so it was slower even when no applications were runing, i have hp pavilion dv6t- 1200 and suddenly it freezed. I dont have battery so i removed ac. Then pluged back in, pushed power button, i could hear fan and hdd but nothing happened, i can see leds and hear hdd and fan on startup but thats all...and i dont have display, my pc was connected via hdmi which started on logon screen so im not able to see any error or anything...i tried hard reset, removing rams and hdd and battery on mobo with no luck...i tried win key + b + power button to downgrade bios and leds start to flash 3 times and maybe 20 beeps...please help i dunno what to do :-\ any help will be appreciated
 
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