SOYO SY-P4I845PE - Manual (Page 14)

Hardware Installation SY-P4I845PE
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Step3- Install expansion cards.
Step4- Connect cables, case wires, and power supply.
Step5- Power on and enter BIOS setup .
Step6- Install supporting software tools. See Chapter 4 for more info.
Warning: Turn off the power to the Motherboard, system chassis,
and peripheral devices before performing any work on the
Motherboard or system.
BEGIN THE INSTALLATION
Step 1 Install the CPU
CPU Mount Procedure: To mount the Pentium® 4 Socket mPGA478
processor that you have purchased separately, follow these instructions.
1. Lift the socket handle up to a vertical position.