My yahoo.co.uk e-mail account stopped working. Help please?

My yahoo.co.uk e-mail account stopped working. I can log into messenger ,my yahoo, change settings etc but when I try yahoo mail it fails. Using the same computers, other yahoo.co.uk e-mail accounts can be accessed with no problems. I've also tried to download e-mails on Outlook Express with the pop... show more My yahoo.co.uk e-mail account stopped working. I can log into messenger ,my yahoo, change settings etc but when I try yahoo mail it fails.

Using the same computers, other yahoo.co.uk e-mail accounts can be accessed with no problems.

I've also tried to download e-mails on Outlook Express with the pop access and fwding settings (old e-mail when we were allowed to "pop access and fwd" free) but failed at that briliantly as well.

Please, pretty please, is there anything I can do to fix this? Incantations, magic numbers, change some settings?

Thanks in anticipation.
Update: I've tried the methods in the first anwer below, none of them work.
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