Multi-Function Display

Hi!

I purchased a used 2003 Prius last week. Since then, I have noticed a strange message (which has since disappeared). It said, " PS Main (battery) Problem." (Is this Power Surge? Power Steering?...) I have not seen it again since the single day it occured two days ago. I messed with some buttons, and now the screen is completely blank. It did not come with an owner's manual so I am not sure if this is a real problem, and I also don't know how to get the screen back up. Radio works, A/C works, screen boots up with Toyota display when I start the car, and the redio station is shown on the screen when I change stations. Other than that, it is blank and black. Are either of these real problems? Did I just turn the display off somehow? If so, how do I turn it back on?

I am sorry for the questions if they seem really stupid. Bear in mind that this is my first prius, and I only recently purchased it (with no owner's manual). I have purchased a manual online, and am waiting for its arrival. Please help!

 

Screen is back on. Thanks!
I did notice a popping sound during the turn while the message was displayed. Strangely though, when I drove it the next day, the message was gone, and it seemed to drive and turn normally.