It's the No Power DELL w2600 TV that , has Powered UP ?

It's power up know , on playing like new. It's been 2 weeks or more of door stop duty. Working grate, I don't want to turn it off. I've heard you can put it in standby mode? But I don't know how. If you can tell me Please do. Or a Fix for this crazy thing. PS It works a week then it takes a vacation for 2 weeks or when it gets ready to come on. I kept a fan on it, it seams Hot. This last time it come on, I put the tv out side in the front seat of my car ,so the cool knight air could get around it. I caried it in side. It didn't come on that night but came on the next morning. The cool air or shacking it around or it was scard it was going to the DUMPSTER ???????