MacBook Pro Loses Wireless Connection?

Question

I have a MacBook Pro and a PC Notebook connected to a WiFi network. The MacBook Pro drops the connection periodically as the AirPort icon shows no connection. When I click the icon it shows a list of 2-3 wireless signals, one of which is my network but it is unchecked. Selecting the network again reconnects the computer.

Previously I had an iMac which never lost connection.
The PC does not have this problem.
Does not change if the PC is powered on or off.

I tried changing the AirPort settings from "By Default join: > Automatic" to " > Preferred Networks" but that did not solve the problem.

The connection loss does not correspond to screensavers, idleness, or logging out. It can occur while actively using a browser.

Software is up to date.
The distance to the wireless access point is about 30-35 feet.

Answer 1

One of my customer has an 17" MacBok too with the same problem, we installed an high power antenna which has a mile range (the house is huge), they can get wireless on the 5th floor, yet on the Mac, which is same floor but 2 rooms away, the connection will drop at random totally without warning, we tried everything to find the cause but without luck, they have a PC which also the same distance but next room, that never drops.
I think its the Mac's hardware but cant prove it

Answer 2

It seems as though it's not your Mac. Honestly your best bet would be to call your schools IT Help Center and get them to re-establish connection to your hard line ethernet box. If they can't figure out the problem, which can often happen, try disabling your WIFI in your Network Preferences, and restart with the ethernet plugged in. Hope this helps.

Answer 3

Run Software Update to see if there is an update addressing that problem.
http://www.macfixit.com/article.php?story=2005093011343164