In most cases, it is not. Most laptops use "on-board" graphics chip sets, meaning they're a part of the motherboard.
You cannot change your laptops graphic card.
in limited space you can install special components. you can use graphics card to upgrade your system for better performance.
Yes you can - this applies to Desktop computers however - laptops usually use an on-board graphics card - the manufacturer will usually offer an upgrade service
No, the graphics chip is embeded.
No, the graphics chipset on nearly all laptops is on the motherborad and laptops do not not have expansion slots. Desktops often have "on-board" graphis as well, but they have expansion slots so you can disable the on-board graphics and add a video card to one of the expansion slots to upgrade the graphics.
Upgrading your laptop's graphics card is no walk in the park; in fact it's something more akin to open heart surgery. But it can be done, and the rewards can be well worth the trouble and risk. in short yes it is possible but very expensive
The Graphics Card in the Fujitsu Lifebook a512 is not removable or upgradable. If you want to upgrade the Graphics Card, it isn't possible. If you have a faulty Graphics Card, then you will need to have the entire Motherboard replaced.
Most motherboards with onboard graphics have a slot for an upgrade card. The answer for yours will depend on the specific model, but it is very likely that you can.
By upgrading the graphics card.
The Sony Vaio laptops are in the six to eight hundred dollars range. Whether or not you need an upgrade depends on how you are planning to use it. For gamers, upgrade the graphics card and the processor.
No you can't.
You cannot use an ATI Radeon HD 3850 because it is a desktop graphics card. They do, however, have a mobile version of the same card (made for laptops) called the ATI Mobility Radeon HD 3850, which you can use.