2005 GMC seat problem

[Cusser]

We just picked up a 2005 Yukon XL Denali last week, owners manual is on order. The driver seat won't operate electrically, to go forwards/back or up down, the passenger seat controls work. Is there a "lock" for this, maybe on the driver door buttons, that is preventing this from working? The seat did work, even on the automatic movement to let driver exit, just last week. I'm afraid we pushed one of the 500 buttons by mistake, and "locked" its operation. It has some type of Driver1 and Driver2 thing. Thanks.

There IS power to the lumbar button on that seat, can hear a motor actuate.