My USB ports located on a motherboard don’t work. My PS mouse doesn’t work to(only a PS keyboard works propetly). I have to use an external USB card and a USB mouse. I have Dell GX240 system. From a site of dell diagnostics software everything looks good, so I’m thinking that this is a hardware problem between southbridge and USB slots. I’m looking for any suggestioins about southbridge VT 8235 and it’s conection to USB and mouse PS slots or datasheet of GX240 motherboard.