Just ran an HP BIOS update and now the computer wont start. Cant recognize the beeps. On start-up, i get 8 (long?) high pitched beeps, then 2 lower pitch, then 2 higher pitch beeps - same tone as the previous 8 but shorter, then 2 low, lastly 2 high short... no clue what this is referencing. Took the case off and cleaned out the dust. Disconnected all accessories and still nothing.