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you can download this pdf guide from
this will show you the steps to do a USB firmware upgrade.
This may be the problem with the WYSE driver. Ensure that correct driver is intalled and colour profile is compitable. Syncmaster is auto detected by window based OS.the message "Sync out of range" comes due to improper out put video signal.
perhaps over heating problem? These things are convection based cooling. The bottom and top both need to be very clear of obstacles. I seen one in use at an office, and the person had it sitting next to file organiser, she continually placed files on the top of the wyse "because she could". It took a week of constant shutoffs for it to sink in that it needed to be clear of stuff.