Acer Aspire TC-780 - Reassembly Procedures; Reinstalling the Mainboard

52 Aspire TC-780 Desktop Computer Service Guide
Reassembly Procedures
Reinstalling the Mainboard
1. Slide the RTC battery into its socket in the mainboard (1) then push it down (2) until it latches into place.
2. Slide the mainboard into the chassis, with the I/O ports of the mainboard extruding from their port holes,
then lower the mainboard in place.