Not enough info to even hazard a guess!
Try searching the video card manufacturer's website for updated drivers.
Possibly. More likely, if your card has gone bad, you will have no sound output at all and video will be unaffected.
yes
Not usually. Video card memory generally consists of ROM chips soldered directly to the card, so if the graphics card goes bad, it's best to replace it.
More than likely the video card is going bad.
You need to update your video card drivers. Typing "[Video card name] drivers" in Google usually gives you links to driver downloads.
It could be due to a bad graphic card or drivers. You need the right type of video card (graphics card). It can also happen if you have too little physical RAM or too little virtual RAM.
Drivers are part of your computer's operating system, they are not part of Minecraft at all.
Either the monitor or video card are bad or the wrong software driver is being used for the video card or the refresh rate is out of range for the monitor. How to resolve it: Plug in a different monitor swap the video card into another PC or try a new one make sure the correct software driver is being used for the video card. Or there is simply too much dust in the video card fan. Q-tips may be the solution.
* your video or power cables are not connected properly. It could have reached the end of it's lifetime * The video card may be bad.
Perform a windows update, and make sure you have the latest version of java
first of all, bad grammar! Yes, geforce 256 mb supports pixel shader 2.0. I'm talking about nVidia Geforce g 105m video card