Reseat CPU/RAM; if unresolved, the motherboard may be failing. CPU is overheating. Check the cooling fan and thermal paste.

Computer beeps or a light blinks during startup - HP Support

BIOS beep codes on the HP Pavilion dv6000 series are audible diagnostic signals used to identify hardware failures that prevent the system from completing its Power-On Self-Test (POST). Because this specific model is known for motherboard design flaws, these codes are often the first sign of critical component failure. HP Pavilion dv6000 Beep Code Meanings

The dv6000 typically uses standard HP/Compaq BIOS codes, which may be accompanied by blinking lights on the Caps Lock or Num Lock keys. Beep Pattern Diagnostic Meaning Recommended Action Everything is normal; POST successful. None required. 1 Long, 2 Short Video/Graphics adapter error. Often indicates a failing motherboard/GPU on this model. Repeated Long Memory (RAM) error. Reseat or replace the RAM modules. 3 Short Memory error in the first 64 KB. Reseat or replace the RAM. 4 Short System timer or motherboard error.