There may be a variety of reasons why Windows won't start after adding new memory.
Firstly, you have to make
sure that the BIOS recognizes the new memory. If BIOS is okay and Windows is
still not cooperating, try to install modules individually to isolate any defective module
that may have been causing the hang system, that is, if you have more than one module
installed. If all memory modules
work individually but not together, then you may need to do some serious
diagnostics to identify the problem. Microsoft
Online Crash Analysis offers a comprehensive diagnostics program in order to correct
Windows errors related to memory.