Wifi suddenly went mad!

Originally I had a 100% functional wifi network including my MacBook Pro (OS X 10.6.8), an Airport Extreme as WLAN router, an Airport Express to stream music from my MacBook, my PS3 and my iPhone, all connected over WLAN.
All of a sudden nothing really works anymore.
Numerous unsuccessfull calls with Apple Care and appointments with Genius bar.
Even bought a brandnew Airport Extreme and requested a brandnew modem from internet provider.
Cables all checked and okay.
Hardware in general seems all okay.
However, WLAN via MacBookPro, etc. is gone. Have tried everything.
Now - I can regain a 100% functional wifi network using my very old Siemens Gigaset SE551 WLAN router, my very old IBM Thinkpad, my fairly new Airport Express, iPhone and PS3!!
But: when I use my MacBook Pro instead of my Thinkpad, the wifi network sometimes works and usually does not. Numerous very strange network phenotypes then.
Wifi radar shows nothing conspicious.
What could I do now??
Buy new Airport Extreme?
Done.
Ask for new modem?
Done.
Cables?
All checked and apparently okay.
Buy new Macbook?
Can't afford.
Does anybody either had the same problem or has a good idea?
Thank you so much!

Draganta wrote:
Asked Apple support. They told me to make a HARD reset.
What exactly do you mean "hard reset", to your Airport router? Better yet, what type of router are you using?
I stongly believe it's something in the OSX rather then a hardware error.
As a Mac technican, I strongly disagree. Though there are many factors, the Operating System should be the least of your concerns. Mainly because this is an intermittent connection issue. Typically, this symptom is caused by wireless interference.

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