Home Forums Mac Software Mac Operating Systems Password required but not accepted

I keep getting asked for my password for almost everything that I do on my mac , this is something that has recently srarted. I put in my password , but it says it's the wrong one - i know it's not !! i cant even get into the keychain access to change the password , i restarted the computer usind the disc and changed the password there , my wife typed in to confirm i got it right the first time , it's still wrong . now my hard drive and idisc are not on my desk top. this is a toughie .