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If, this is not an LCD screen and one of the old CRT monitors this means it is leaking it's vacuum and can become unstable and ultimately dangerous. You should replace it.
If, this is an LCD monitor then you have an electrical short either on the inverter or the screen, you should take extreme care and take it to have it serviced as any electrical malfunctions can ultimately become dangerous.
You would have to try an INIT and see if it causes the tv to be operational again. It is something that you have to be walked through step by step by step and can erase the memory of the tv if done improperly. Call Sharp tomorrow morning at 9AM CST and someone can walk you through one. Call 800-237-5277 or if you have an aquos advantage model call 87-332-7867
The walking belt slows when walked on the walking belt maybe overtightened, treadmill performance may decrease and the walking belt may become damaged or the opposite the drive and /or running belt may need tightening. Last thing would be that the belt needs lubrication to be applied between belt and deck.
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
I would suggest either the Focus block or the RED CRT drive board either one of those items could cause the symptom. A defective CRT could also, but a shorted CRT doesnt usually go back to being normal
Here's an oddball, but if you have some thing similar, hopefully helpful. The problem turned out to be the focus anode (coming out of the flyback, going to the focus block) had broken loose enough to start arcing inside the flyback. Gently pulling the wire out of the flyback, clipping, stripping and tinning the end, and gently pushing the tinned lead back in until it locked proved to be the answer.