Garbage on the screen instead of setup screen

Hi
My son's wrt54g2 v1.5 linksys router was working fine.  WPA2 mode was setup also, working correctly, until he came home one night and wasn't able to use wifi.  Computers, phones etc., that were setup with the security code could not logon.
I had him try to use his browser and connect using 192.168.1.1, but, all that came up with was a screen full of garbled characters instead of the setup screen.
Next I had him try to reset the router, holding in the reset button for 30 seconds, then coldbooting the router.  Unfortunately, the same garbled character screen reappeared.  Fortunately, it did reset the security, so he can use the router without security. 
We really don't want to leave the router running without WPA2, and, would like to once again access the routers setup, so, If someone has any ideas, I'd appreciate suggestions.  We've already reset the router 4 times, and, it works connecting to the internet fine, we just can't get into the routers firmware to reset passwords or setup WPA2.  Tried connecting using both Firefox and Chrome, his laptop uses Windows, mine Linux.  Tried accessing using wifi and using ethernet.  Did I cover it all?
Thanks in advance
Tom

Thanks again for responding.  And no, there are no firewalls on the computers I used for testing.  We use the router as our firewall.  Today, I used my "siduction" install (Debian Sid) to see if I could come up with anything interesting, which needless to say, I didn't.  I'm one of the Core members of "siduction", and, we don't install a firewall by default.  It's up to the user to install it if they deem it necessary.  I also use a Linksys E2500 for my own home network, and the same laptop worked perfectly fine bringing up my router's setup screen before I used it to test my son's router.  I also use Fedora, which comes with an automatic firewall, and, that install also had no trouble with the setup screen.  I also have openSUSE on my network, along with a few Windows dual boot laptops.  All of my machines bring up my 192.168.1.1 without incident. 
Is there anyway to test the RAM and/or firmware without being able to access the linksys using 192.168.1.1?  I'm starting to think that the router is just suffering from old age and there might be a hardware problem.  Its also possible that he might have had a power line drop or surge that might have affected the router.  While I have all my electronics plugged in to UPS's, he had his router plugged directly in to the outlet.
It's funny, everything the router is supposed to do, it is doing well.  It's supplying IP addresses, accepting multiple wifi logins, and asking for a password to enter setup.  It just won't show me the setup screen.

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