Computer doesn't find my network

[Scott5238]

Wireless worked fine yesterday.  Today, I get "Not connected, no connections available" even though my other newer HP laptop sitting right next to the Pavilion dv6 sees my network and connects like normal, as does my Motorola Droid.  I run troubleshooting, it can't find the problem.  Looked for a Network adapter to reinstall the wireless network adapter driver, per HP Customer Support Knowledge Base document "HP PCs - Troubleshooting Your Wireless Network and Internet Connection (Windows 7)".  In Device Manager under Network adapters, all I see is "Bluetooth Device (Personal Area Network)" and "Bluetooth Device (RFCOMM Protocol TDI)" - nothing that looks like a WiFi adapter.  Therefore, I didn't mess with anything there.  I unplugged both modem and router, wait 1 min, plug modem back in, wait for it to come online, plug router back in and restart Pavilion-no change.  I unplugged Pavilion from charger, remove battery, unscrew access panel on bottom, remove a lot of crud, unscrew wireless card, check connections (seem good), replace wireless card and make sure it's seated in socket as good as I can, replace panel and battery, plug in charger, restart, no change.  I unplug RJ45 from modem to router at the router and plug in to RJ45  on Pavilion and restart - Pavilion recognizes a network now, but not my home network, just some unknown network, but at least now it's seeing something.  I was eventually able to get the Pavilion to see my home network and access internet by going from modem direct to Pavilion via RJ45, bypassing wireless.  When I reconnected modem to router (disconnecting Pavilion RJ45 in the process) and try Pavilion wireless again - no joy.  Any ideas?