I've only had this computer for a week or two and I've found that I cannot get it to 'wake up' from sleep mode.  I have to actually unplug it and then plug it back in to reboot it.  I called customer support and they had me do a complete system reset and that hasn't worked.  I'm am very frustrated as I bought this for a new job I am starting next week.  We bought this model after researching it through Consumer Reports.