- loosen access door screws (x3)
- hard drive screws (x5)
- remove base screws (x5)
- under battery screws (x4)
- optical drive screw (x1)
- screws at side of under the optical drive (x2)
- Palm rest screws (x6)
- motherboard screws (x6)
- heat sink screws (x4)
- loosen/remove cpu locking screw (x1-2)
- power button screw (x1)
1 Beep: Replace the motherboard / system board. 2 Beeps: Reseat the memory or replace the memory. 3 Beeps: Replace the motherboard / system board. 4 Beeps: Reseat the memory or replace the memory. 5 Beeps: Replace the CMOS battery. 6 Beeps: Reseat or replace the video card or replace the motherboard / system board. 7 Beeps: Reseat or replace the CPU or replace the motherboard. 8 Beeps: Reseat the LCD cable or replace the LCD screen.
More info here