Is it a vga problem or motherboard has shocked?

[ftomsuk]

I had a System power up problem, so I performed the following actions:
1. I removed the cpu fan
2. I cleaned the thermal paste from cpu with isopropanol
3. Placed a new cpu fan
4. I hit the switch power button( no result)
5. Take the motherboard battery out, and put it back, take the RAM out and put it back, all cables are checked and placed properly
6. I hit the switch power on again ( motherboard led is on, psu fan is working, cpu fan is working, case fan is working, but there s no image on the monitor)
7. Monitor checked with other pc, it s working properly
8. Take the mother board battery out, cleared the RTC RAM in CMOS(Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for about 5~10 seconds, then move the cap back to pins 1-2.
9. Re-install the battery.
10. Plug the power cord and turn ON the computer.
11. Hold down the <Del> key during the boot process. Screen powered up, but all I can see is coloured strips on the screen

What could be the problem now?
The motherboard ?
Bios settings? If yes how can I fix this problem
Onboard VGA?
Can Anyone help me out?
Motherboard is Asus P5GL-MX