some web pages cannot be seen using broadband

Yesterday a friend had a router failure.  I replaced it with an almost identical one (Belkin)  Everything works fine except that some web sites cannot be seen. If the PC is used with dialup, then it is ok, but if the page is accessed over the router then sites such as cannot be seen.   I have tried disabling the router firewall but to no effect.  Other PCs on the network are behaving in the same way.
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Computer101Connect With a Mentor Commented:
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1. Clear your DNS cache.  Go to Start > Run and type CMD
and hit OK.
At the command prompt, type ipconfig /flushDNS
and hit OK.

2. Clear your cache.  Go to Tools > Internet Options > General tab.  Under Temporary Internet Files, click "Delete Files" button. Also click "Delete Cookies" button. Click OK.

3. If no joy, check if your PC is blocking the site.  Do a search for HOSTS file and open it with an editor like Notepad. Delete any line that has the blocked site in it.

HOSTS file is located in
Windows XP      =      C:\WINDOWS\SYSTEM32\DRIVERS\ETC
Windows 2K     =     C:\WINNT\SYSTEM32\DRIVERS\ETC
Win 98/ME     =     C:\WINDOWS

It is a hidden file. Go to any folder and select Tools > Folders Options > View. Check "Show hidden files and folders". Click OK.

4. If you are using Internet Explorer, check if the site is restricted or blocked.  Go to Tools > Internet Options > Security. Hightlight Restricted Sites and see if the blocked site is located there.

Also under Content tab > Content Advisor, check if the site is restricted there. Remove it.

5. Check if antispyware, antivirus, or firewall is blocking the website.

6. If no joy, we narrow the problem down to the router.  Replace the router.
jcollesAuthor Commented:
Thanks for your reply.
I have just got back from having a look at the system and eventually found the problem.  The router was set to PPOE and not PPOA.  The strange thing is that that was how the old router had been set and it worked ok-
thanks again for trying to help
jcolles, glad you found the setting in the router that is causing the problem.
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