WRT160N V3 / Computer No Longer Connecting Wirelessly To Router After Tomato Clean Install

I just installed Tomato firmware (details below) on my wireless-N router and everything appears to be working fine on the router's end. I can connect to the Internet properly with a wired (Ethernet) connection; in fact, that's how I posted this question.

What I cannot do is connect to the router wirelessly in any way. At first, I thought that something was wrong with my wireless security settings, because I read about some incompatibilities between Windows 7 and AES encryption. However, when I changed to TKIP, the issue persisted; when I switched from WPA2 Personal to WEP, the issue persisted; and when I disabled wireless security entirely — just for testing purposes — the issue still persisted.

My Internet search for this issue brought up a lot of old forum and mailing list posts, most of which were useless. The only one that seemed promising suggested disabling Afterburner, but that came disabled by default on my install. I did try enabling it and then disabling it, but it had no apparent effect.

In case it's relevant: before I installed Tomato, I had a somewhat funky install of dd-wrt on the router. The first thing I did after installing Tomato was a full clean of the nvram through the web GUI's Administration → Configuration → Restore Default Configuration menu.

What do I have to do to get wireless running? I only have one computer available at the moment, but I'll try to update later if and when I can borrow more devices for testing.

Assorted specs:

Linksys WRT160N v3
Tomato Firmware v1.28.9054 MIPSR2-beta K26 Mini
Linux kernel 2.6.22.19 and Broadcom Wireless Driver 5.10.147.0 updates

EDIT:This is a computer issue, not a router issue. Two smartphones with wi-fi connections and another computer are all able to connect to the wireless network with no problems. However, the original computer was able to connect to the same router just fine before Tomato was installed. It has an internal wireless-B/G card, and I had Tomato set up to broadcast G-only, so it should have been compatible.

EDIT 2:The computer in question was the only device in the house that wasn't set up for wireless-N, so I went out and bought a Wireless-N USB adapter and changed Tomato to be N-only. Using the new adapter, I get connection again. I suppose it's possible that the computer's OEM internal wireless card failed at exactly the same time that I installed Tomato on the router, but that would be one heck of a coincidence. I'll see if I can connect to some other G or B network next time I'm around one....