IBM Aptiva 2142 - Manual (Page 141)

2051—Memory (DIMM)
Attention: Memory modules are sensitive to static discharge. See
“Handling ESD-Sensitive Parts” on page 4-16.
Push out on the side clamps to release the module.
Pull the module up to remove.
Note: Run the Setup Utility after adding or removing memory.
Figure 4-11. Memory DIMM
Repair Information 4-13