Leopard on a Digital Audio G4 - can't access certain sites

Specs:
Digital Audio PowerMac G4
1.5GB RAM
1.7GHz G4 Sonnet Encore/ST; previously 733MHz stock G4
Leopard (10.5.8)
Network is controlled by a router running DD-WRT v24-SP2.
I am having a horrendous time trying to get this specific Mac to access certain websites - namely, anything to do with Google or Yahoo. I can't get to YouTube, I can't get to ANY Google site (including non-US domains), I can't get to Yahoo (or any of its services, like Flickr, del.icio.us, Zimbra, etc...)...obviously, this is getting a tad frustrating. I've been relegated to searching with Microsoft Bing for the time being...oh, the irony...
At any rate, I've tried flushing the DNS cache (dnscacheutil -flushcache), flushing the routing tables (route -n flush, route -v flush), assigning a new IP on my LAN, using other DNS servers (OpenDNS and Verizon), putting the machine in the router's DMZ, and sacrificing a kitten to the flying spaghetti monster.
None of these things have worked. I cannot figure out for the life of me what the problem is. It's not a DNS issue - I can ping google.com and it resolves it to an IP...of course, pinging fails since I can't actually connect to it. I've also tried connecting to other known good IPs for google.com.
I don't see this problem on any of my other Macs running OS 9, Tiger, and Leopard. I don't see it on any of my machines running Windows (XP Pro, Vista Ultimate, Server 2003). I don't see it on my iPhone or my boyfriend's iPhone. I only see it on this one machine, and it used to not be a problem. I'm going nuts trying to figure out what happened.
Any help is greatly appreciated.

Nope. In fact, here's a comprehensive list of what I've tried:
using other DNS servers
flushing the DNS cache
flushing the routing tables
removing the ethernet interface and re-adding it
creating a new location in the networking preferences pane
installing an Airport card and using that instead of ethernet to connect to the network
setting up a static DHCP IP on my router (using MAC registration), releasing the old IP, and picking up a new one
putting the machine in the router's DMZ
trying tracert or ping to get to external domains and IPs
clearing out /tmp in case some temporary file(s) were causing a problem
setting up a new user account and logging in with it
There is something low-level in the system that's causing this problem. Trouble is, I have no clue what it could be. I'm right now downloading the combo updater in the total off chance that it will replace whatever corrupt file is breaking my Internet connection.

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