Which PC for £500

Go to flickr and ask for a password reminder (they might use different accounts or something for yahoo, I dunno). Make sure you are using the right one.

If your username and pw are ok..

Close your browser and restart it. Then go straight to the sign in page for flickr and try your username/password combo again. If that doesn't work clear your browsers cookies and repeat.

closed the browser; no luck. I 'changed' my password earlier so I know that is ok; I can access Yahoo groups and mail but not Flickr; it keeps telling me I am ready to open my new account with my Yahoo ID.
I don't know what clearing cookies means.
Ealier today my computer crashed and wiped everything out. I was using Firefox so that is where all my passwords were. Can't get in to Flickr on Firefox either. It is the only site I am not able to get in to now; bank account, e-mail, everything else is fine.