wlan greyed out, missing standoff screw upper right corner

Hi,

I just tried to find a solution for my problem on myself, but I wasn't able to google anything.

I recently bought an iPhone 4, which has the problem, that the wlan is greyed out. So I thought, it should only be the wifi antenna, so I bought a new one (including speaker, so not to screw anything up!) for 15€, tried to install it. Hasn't fixed the problem (even brought me a non working "enter pin" problem), so I removed it again.

If you do it right, you don't have to remove the whole logic board to get to the speaker, so when I tried to put it back together I noticed a missing screw.

http://guide-images.ifixit.net/igi/diPxJ...

On that picture its the upper right, orange circled one.

Below that one there SHOULD be follow screw:

http://guide-images.ifixit.net/igi/1nvkV...

That should be a 4.8 mm standoff screw.

If my WLan is greyed out, could those 2 missing screws be the reason for it?

If so, can I buy those anywhere? Like I only need the 4.8mm standoff screw, I could use the other orange circled screw (from the upper picture) if neccessary.

Thanks