No vga signal

Imeodb

Prominent
Mar 29, 2017
1
0
510
Soo i have a desktop with:
an Asus a8n-sli deluxe mobo
AMD Athlon 64 3200
Leadtek LR2A22 Nvidia GeForce 6600
And 2 512mb DDR RAM Sticks

I got this system yesterday and decided to clean it a bit before using it.
I didnt take it completely apart, just some main parts cpu, gpu, ram, hdd and fans. Now if i want to boot it, my monitor doesnt show any signal and after a while it beeps 2-1-1-1, seems to mean "set Initial cpu speed", but since i dont have any video signal i dont know what to do..

Here you can see how it boots: https://youtu.be/vSYjEI9uobQ

Ive read somwthing about "post", which seems to be a diagnostic by the mobo to hear with headphones. How does that work?