Magnetic screwdrivers are very handy for keeping screws, especially those so small they are barely visible, stuck to the screwdriver. However, also very unhandy around disks, hard drives, TV sets, etc and not all screwdrivers are in the first place and can be in the way getting the screws off it. With a ferromagnetic but not magnetized screwdriver and a neodyme magnet, you can have it both ways.
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As to TVs. Again, a magnetic screwdriver shouldn't be a problem when used to remove/insert screws. Never (read NEVER!!!) use a metal screwdriver of any sort to calabrate a TV or monitor. Always use plastic tuning tools.
Other methods for magnetising the screwdriver which I have used are:
Rubbing with a Magnet
Rather than attaching the magnet to the screwdriver, just running it along the shaft of the screwdriver (a few times, and in one direction) will pass on a weak, temporary magnetic power. Not perfect, but when you are working around alot of ferrous parts and you just need enough "stick" to hold the screw, it can work wonders.
Shock the Screwdriver
Sounds strange, but is a trick I picked up from a mechanic friend - you get some cable (almost any gauge) and twist it around the shaft of the screwdriver (rolling it in one direction and from the handle towards the tip). Touch the ends to a battery for a short period (only a second or two - otherwise, you may melt off the insulation, or screw the battery) and now the shaft should be somewhat magnetic.
Both of these methods are temporary, and not terribly strong, but may also be options for some jobs. Of course, using the second method should never be used with any power source other than a car/bike battery (mains power tends to tickle).