Hello friends of the forum sorry for bothering you well I want to tell you that this question I already did earlier for the same reasons only that for being the ratings of answers I closed the question, this issue is for the update of this page that little understood it for Validate answers but little by little one is going to learn how to use this new version, but I want to tell you this is very good the latest version of yoreparo. Well I have this problem of this sony computer with its swuichs that do not work for nothing only that that says CD and PLAY to precionar appears the suitable ocpcion but when it is released it is changed to USB and of that form already can not be done nor can be ignited the computer now I want to open the front but I do not leave the tray because I can not open it so they do not give the buttons but with the remote control if the equipment works well or with the control and I did some tests of the buttons not ay niguna that in short tabien midi voltages in them that must be in .3v and I have some readings in the row where the button is stamby has a voltage 3.20v on the other side equally but more to the foot where is the volume the CD button and PLAY are 0.30 and 0.66v others 0.20 and so now I want to change the buttons but the tray does not let me remove the front and there is a disk inside but with the control plays well I want your help give me the hand to solve the p roblema I do not think it is the micro ahi according to the form IC-401