Pads doesn´t work and more..¡¡

Hi,..first thanx for reading¡¡,..some pads of my mpc 500 doesn´t work, I mean I press it and nothing happens,.but when I go to mute menu, and I mute the pad 1, mutes the pad 3 at the same time,..(one of those that not work¡¡¡)...and the same with the non-working others , I mean also, when I mute the pad 4, also mutes the pad 6,..the non-working pads are muted by some of working pads at same time, I only see this in mute menu,..then I can´t use this non-working pads for anything (program, save,..etc)...do you know what to do???
hope you can help me, yhanx in advance

i would take it apart and check the ribbon cable that hooks the pad sensors and make sure it didn't slip loose… have you taken it apart before?? did you buy it second hand, has it always done this?? need a lil more info here….

What do you mean by "mute menu"? are talking about track mute? in track mute you can't play pads, when you press "pad 1" for example, it will mute out every pad that you sequenced on "track 1" If you wish to play the pads again you must exit the "track mute" menu.

Hi,.thanx for your answers,.

to inflict3,..I´ve never checked the ribbon cable,.and the machine is brand new,..and start doing this after not too much uses,....

to ralphyartis´:you´re rigth, "track mute menu", sorry,..when I press the pad 1 mutes the seq. on track 1 and mutes also the seq on track 3 (pad 3) , you can see somethig like this on the screen:"M..M......", both at same time¡¡¡,.....when I press the mute for the track 4 (pad 4) mutes the track 6,..."......M..M.."both at same time too¡¡
and, the try to enter the program menu: mode + Pad 6,..doesn´t work these pad,..and the same with pad 1...and so

hope I can explain myself clear, english isn´t it my born language¡¡
thanx in advance¡¡

something is screwy with ur pad sensor sheet, i kinda feel like the ribbon cable on the bottom right slid out a lil.. one time i put my mpc500 back together after replacing the screen and didn't slide the ribbon cable all the way in before sliding the lil clip closed and when i put in back together it did shit like you are saying.. take the front off, just the six screws on the back parameters, not the middle 2 and the six screws on the front and back faceplate. when u see the ribbon cable there is a piece u can pull back, or up, that is a clip, pill that then slide the ribbon cable out and try sliding it back in all the way and press that clip back till u hear it click. now power ur mpc up while apart and load up something and see if those pads work…good luck, pm me if needed