There are about a thousand things that could've happened. Was someone else using a lot of the outlets in the house for powerful stuff (hair dryer, etc.)? That can cause a short although that's probably not what you have.
Some things to try- The outlet could be bad. Try plugging in a lamp that you know works. If it still does, that eliminates that as an issue.
- Check the fuses or circuit breaker, make sure nothing's tripped
- Speaking of tripped, if there's a GFCI on the outlet (they're red and black and say Test on them), check to see if the button is pressed or if it's jutting out. Try the opposite of whatever it's doing (again, with a lamp that works). The reason I'm being vague about this is that these can be of differing designs. It's not likely to have a GFCI except in the kitchen or bathroom, but it's not impossible.
- Call the cable company (if you have cable). Perhaps the cable is/was out.
- Try unplugging, then plugging the TV back in. And, of course, make sure it's plugged in all the way and hasn't been jostled.
- Try turning it on and listen for the sound of the picture tube (it's a high-pitched whine) and for any lights that come on (if any). That is, make sure it's getting power.
- If it has to be set on a specific channel, like 03, to work with a cable box or DVD player, check to see if it's set properly.
- It seems an obvious question, but it should be asked -- did the power go out?
- Was the remote (or the TV itself) switched to DVD or some other setting where it might not be obvious that it's on?
There are, I'm sure, other questions. I'm just an amateur but I'd start with eliminating things like this because it will help if you can tell a repair service (if you wish to go that route) that you tried this, this and this. Also -- for those who answer this after me -- please answer a few questions:
- What's the age, make and model of the TV?
- Is it hooked up to cable, satellite, antenna or something else?
- What peripherals are on it (DVD player, VHS, Playstation, stuff like that)?