Won't turn on

Do the menus work or input labels appear when you change sources?
Have you tried unplugging the power with the tv turned on, waiting a few minutes, then plugging it back in and turning it on?

I would go to the positive terminal on the battery anjd check for black hard build up on the post and inside the terminal. This is lead sulphate and cause a high resistance to any high current flow. Clean both with sand paper until shiny and refit and tension properly. Do the negative also as it will have build up but to a lesser degree. If the battery lead runs through a connection box Check for tight connections there also. As to towing most towers have a wheel rack that fits under the tyres and lifts them clear of the road so it can be taken to to a shop.

My Samsung 42inch plasma ps42a457p1d won't come on at all I've switched it off & on & changed the fuse the light came on for a few seconds then went off again

something burned means do not plug back in etc--consider getting an estimate for repair--not a do it yourself thing.

try to boot the computer in safe mode with networking.

You have stumbled upon a direct short that has to be repaired first. When you find the short you will need to find why the insulation is worn. Correct why insulation bad, then use electrical tape to wrap the spot and a couple of inches on either side of it. Find the fuse and replace it. You should be good to go.

I would suggest to go to Fred Meyer or an equivalant store and go to the electronics section. Find a new DS Lite battery.

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

If it's intermittent or random, it may be a bad connection, usually on the control board or fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

We appreciate your thoughtful rating of our answer.

Solder, solder, solder! Shut down circuits protect crts to avoid permanent damage. If any of the deflection circuits are defective, or intermittent, shut down occurs. I have not only seen bad solder on deflection circuits, especially vertical, but also intermittent connections on the yokes themselves. I've also seen shorted convergence ics cause shut down. Don't forget solder connections in the power supply.