The motherboard provides several connectors that are attached to the case LEDs, indicators, and switches. These connectors vary depending upon the motherboard, but the ones described here are typical. The physical layout of these connectors can very a lot as well; some motherboards physically separ. these connectors on the board while others gr many together into a large "multifunction connect Functionally, there is no difference but it is easier make an "off by one" connection mistake on multifunet'ion connector. These are the p connectors you will typically find on a moder motherboard:

• Power LED and Keylock Switch: These are two differ functions, each requiring two pins, but for historical reasons, they are often combined into a single 5- connector. Older cases had the keylock and power wires going to a single 5-pin plastic connector. On n cases they are often separated (in fact many newer have no keylock switch) but the 5-pin motherbOl connector remains for compatibility. Here is its usual configuration. Note the unused pin between the power LED pins: -
Pin Number Signal
1 Power LED Output (positivel
2 No Connection (NC)
3 Power LED Ground (negative
4 Keylock Signal (positive)
5 Keylock Ground (negative)

• Reset Switch: This 2-pin switch has no polarity so can connect it either way.
• Power Switch: On ATX systems there will be a conner for attaching two leads from the case power on/off butt:
On ATX PCs, the power switch sends a signal to motherboard to turn on the PC; it doesn't attach dir to the power supply as it does on older AT style syster

• IDE/ATA Hard Disk Activity LED: This connector signals the LED when the motherboard detects activity on ar the system's IDE hard disks. Some motherboards four pins for this connector. On many of these, the I pins represent two different pairs, both of which pins 1 and 2 are one pair and 3 and 4 are another, either pair can be used. On other motherboards, only. of the pins can be used; you need to check 1 motherboard manual.

• Speaker: This is a 4-pin connector for the case spea but only the two outer wires are used. There is no polarity here either, you can connect the speaker either way.

• CPU Fan: Some motherboards have a 2 -pin connector for PDwering the processor's fan, if the fan has the right type 01 power connector. Many fans just connect to the regular power connectors from the power supply.

• Suspend Mode Switch: Some systems have a two-pin nnector for a toggle switch to put the system into a remote power switch in the front. The AT power supply provided 192 watts, a triple hat of older form factors. suspend mode. The turbo switch button on the case can be used for this function on newer systems.

• Suspend Mode LED: Some systems have a connection for an LED that is lit when the system enters into suspended mode, either by using the suspend mode switch or through automatic power management.