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Among all the PC components, the power supply is the most dangerous.
It converts the 240V wall voltage into smaller 12V, 5V and
3.3V DC allocations required by the PC. Usually, the power supply
comes with the cabinet and is backed
by a warranty so you shouldn’t have
problems. However, it pays to be careful
and take the extra effort to verify
the quality of the power supply. If you
are purchasing it separately, opt for a
brand name. Check around with your
friends, the Internet and other system
builders. Horror stories of faulty PSUs
that blow up and ruin entire PCs are common, so be careful. A good quality PSU will not only give your system a long life span, it will
also help reduce the noise and heat generated inside the cabinet.