1.4. Working with Power Supplies
Power-supply problems are usually among the ones that are easy to troubleshoot: If the system doesn't respond in any way when the power is turned on or you are experiencing randomly frying parts, or an incredibly annoying sound, open the case, remove the power supply, and replace it with a new one.
1.4.1. Critical Information
The device in the computer that provides the power is the power supply. A power supply converts 110-volt AC current into the voltages a computer needs to operate. On an AT motherboard, these are +5 volts DC, −5 volts DC, +12 volts DC, and −12 volts DC. Components in modern PCs don't use the negative voltages; they're provided for backward compatibility only. On an ATX motherboard, an additional ...
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