I have a toshiba satellite m45, model #psm4ou-073001. I had just finished sending an email with attachments and started to check a different account and found that several keys quit working . the keys are sdz,./gj[ ]q is there a common connection between these keys? why would 11 keys quit at one time? I cleaned and dusted the keyboard with no results. any ideas? please help. thank you very much.