Beeping computer at startup

i just came across a new one (for me) ..... one long beeep (3secs) and then continuous shorter beeps (1 sec). did the usual then noticed the two memory cards had different labels .... two cards of differing speeds! removed the smaller and slower card and ... happiness. customer pays more for not telling me he or a friend "upgraded" it immediately before the beeping started :)

i hope this helps somebody.