All of a sudden my homepage is taking forever to come up or not at all - is it Yahoo or me?

If its all of a sudden and only Yahoo, its probably them.

all of a sudden my homepage is taking forever to come up or not at all - is it yahoo or me?
Would it do any good to call Yahoo?

Probably not

Change you home page address from http://my.yahoo.com to http://cm.my.yahoo.com.

Yahoo! Has recently changed their My Yahoo web site.