|Could you please tell us the exact make/model of the computer?|
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No, if your onboard graphics are going bad, you could just buy a cheap replacement:
Though you'll have to make sure you have a free PCIe slot and enough room for your computer (this WON'T work for laptops)
Alternatively, have you contacted the manufacturer about the computer's warranty?
If it is a laptop and isn't under warranty, it'd probably be cheaper to buy a new one than to replace the motherboard.
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