The supported Memory types for Dimension 2400 Series is PC2100 (266-MHz) or PC2700 (333-MHz) DDR SDRAM (non-ECC). Supported Memory capacities are 128, 256, or 512MB and a Max if 1GB (1024MB).
obvious question is does the new 512MB Memory module meet the above specification
? Some Memory modules
are able to steep down speed.
If it does, then first ensure the new memory module is properly installed. Take ESD (ElectroStatic Discharge) precautions
or you may damage the new memory module and/or the system
compare the system beeps and diagnostics lights color and sequence to the Advanced Troubleshooting guide
It is possible
that the new memory is DOA (Dead On Arrival). Or there is a new fault on the system. If you have access to another compatible
system, you may test the new and old memory modules. You may also swap the new and old memory modules to determine if the memory slot is at fault.
Lastly, if you remove the new memory module, does the system complete POST (Power On Self
Test)?. If it does you may indeed have a DOA or incompatible