Dear SHEILA,
It looks like you have a Lamp problem and/or DLP Chip gone bad. If you are handy enough, you could troubleshoot and repair the TV. If not take it to a TV repair shop, It may be costly or just simply get yourself a new TV.
Below find some links to help with the repair.
Be sure also to take all the precautionary measures to insure your safety, should you decide to do it yourself. Let us know how it turn out and you should need further assistance.
Best of luck!
https://youtu.be/5vBUWKX96Y0
The bulb is out. You can purchase on amazon for around $20.00. It is a very simple fix. Should take about 5-10 minutes 
SOURCE: Mitsubishi WD-65733 no picture, electrical buzzes in series
What it sound's like is that the lamp ballast is the problem. Buzzing sounds like when the power is first brought to the ballast it has to ramp up the voltage to get the lamp to light, then the voltage drops back down when the lamp is lit. Sounds like the lamp ballast isn't ramping up the voltage the way it should. May have to replace it. A good service shop would be able to do this for you.
Blessings,
A/V Media Guy
Testimonial: "very helpful. this was my first thought! thank you!"
SOURCE: My mitsubishi wd-65733 is making
Lamp could be the problem or Ballast board that powers Lamp on. Encompass Parts Distribution visit their website and look up your Model#
If Problem is Lamp Mats has them for $99.00
1-800-628-1118
SOURCE: How do I remove the screen protector from a
That is a full tear down! I would be very careful when doing this and be in a very clean dust free area!!! You will need to lay the set face down and remove all of the screws around the edge of the set. You will see that the back panel is in two parts you will have to remove them both. Once you have the rear plastic cover off you turn the set over and will be able to pull the screen up and off.
You run the risk real damage to the set with a job like this, the only reason anyone should ever do this is to replace the screen. If you are trying to clean the mirror inside use the small circular doors 3/4 of the way up the back of the set on the sides.
SOURCE: getting white spots on my
Hi,all HDTV have boards that control vertical and horizontal output to their respective areas. They are connected to the screen by ribbon cables. If one of these boards fails all together, has a failed chip, a bad connection, or a bad ground somewhere it will result in a black line in the area of that board and also white spots.
A bad ribbon cable connection on the bottom will result in a vertical black bar though the screen. Many times resetting the connection will fix it, if the ribbon cable has been nicked there could be a severed connection. They an sometimes be fixed, but it is a pain. An yes I have done it, but the bar is gone. The same will happen if the chip that outputs to that area opens.
The connectors are the first place to look paying close attention to the cable, they are extremely delicate so great care must be taken if you decide to tinker with em, the usually have lift locks that release them.
Good luck.
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