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Re: CM7 connection issue
When you lock your phone, the default Wi-Fi policy is to turn off, so when you unlock your phone it has to reconnect to the router. The time it takes for your device to authenticate, lease an IP, and ping Google's servers is the time it takes to turn your WiFi icon from white to blue. You can change this by going to Settings>Wireless & Networks>Wi-Fi Settings, pressing the menu button>Advanced and changing WiFi sleep policy to Never if you're around Wi-Fi the majority of the day. At least change it to Never when plugged in, to help save on mobile data costs.
I have a Moto Droid running CM7 that I use as a portable media player w/o cell service, so I use an Airplane Mode Wi-Fi tool to keep my cell radio off (HUGE battery savings!) and leave my Wi-Fi on. When my Wi-Fi icon turns white, I also lose all connectivity. Even if you don't want to change your Wi-Fi sleep policy, next time the icon turns white and won't change you can fix it 100% of the time by toggling your Wi-Fi off and then back on.
If your Wi-Fi icon stays white, it means that your phone can't communicate with Google's servers over your Wi-Fi connection. Check your other computers for internet connectivity. Let me know if any of this helps!