i cant eject my sd card from a640 help!!!

i cannot eject my sd card from a640. i think it got stucked. please help me. sorry for my english.

Press it down firmly. If that doesn't release it, carefully take hold of the card with fingernails or tweezers and pull. SD cards have an abysmal ejection method - about the most trouble-prone one in existence.

i pressed down and it releases the half of the card. but the remaining , i cant pull it . i woryy about damaging the pins. if i force it , is it possible to damage them ?

If it popped up half way, that's all it's supposed to do. You won't damage the pins - they're external fingers making contact.

i just cant pull it. i force it but it doesnt work. any suggestions except service ?

If reasonable force doesn't work, I guess that you will have no choice but to bring the camera to the service center.

finally i could eject it . but i have another problem. i searched the forum and found the same question with no reply. when i turn my camera to a light source one or two vertical lines appear on the LCD. these dont affect pictures but the videos. any suggestions ?

I believe you're seeing what's called "sensor bloom", which is akin to lens flare in still work. I believe it's related to how the CCD sensors work, and there's not a great deal that can be done (by the photographer) to mitigate it except for keeping light ources out of your shots.