Operating life of Intel Motherboard

Most of the Computing system used in my lab are assembled with Intel Motherboard.
The defect i found are the operating life of the graphic card.
actually after three or four years of usage, the graphic card become out of order.
it just suddenly stop transferring the signal to the monitor.

my personal pc also end up in the same situation.
yesterday, when i return home and turn on my pc,
nothing appear on monitor.

i am thinking of plugging new graphic card,
but i am still not sure weather it will work or not.
maybe i have to try.