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I did some research. You didn't say what density the RAM was, but everything I can find on the Ballistix 800 MHZ DDR2 states that it runs at 2.2V. The standard for DDR2 RAM is 1.8V. You motherboard has both and AUTO and manual setting capability for memory (DRAM) voltage. It is possible that the AUTOP feature is not detecting the need for 2.2V, and that with only one DIMM installled, the memory marginally functions, but with the extra loading of the second it will not. Boot the system with the single DIMM, go to the BIOS, and set the DRAM voltage manually to the 2.01V setting (Verify by the part number of the RAM with the CRUCIAL website that is uses 2.2V before doing this). Once you have changed the voltage in BIOS, shut down and add the second DIMM and see if things improve.
In your notebook configuration, you have
Intel® Pentium® Processor T2370 (1M Cache, 1.73 GHz, 533 MHz FSB)
and this processor model is on socket PPGA478.
The one you are targeting to replace to is
Intel® Core™2 Duo Processor T5500 (2M Cache, 1.66 GHz, 667 MHz FSB
that is on both PPGA479 and PPGA478
so if you want to replace your current processor, just be sure to see if the socket models are the same with the old processor, for other socket number wont physically fit on your old socket.
Also be sure to have enough to knowledge and skill to perform the dismantle of the notebook itself.ElectroStatic Discharge (ESD) is the term used to describe the transfer of static electricity from one object to another, and this is not good for the parts inside your note book.
Hope this helps, and thank you for using Fixya.
Another thing is to have an anti-static wrist strap to ensure no static related event can occur to your hardware.
You are basically limited to what was optional on the model. So you can only upgrade to one of the following cpus:
Intel Pentium M 745 (1.8-GHz) with 400-MHz front side bus (FSB) Intel Pentium M 735 (1.7-GHz) with 400-MHz FSB Intel Pentium M 725 (1.6-GHz) with 400-MHz FSB Intel Pentium M 710 TJ85 (1.4-GHz) with 400-MHz FSB; operates at a lower temperature than other processors Intel Celeron M 340 (1.5-GHz) with 400-MHz FSB Intel Celeron M 330 (1.4-GHz) with 400-MHz FSB
And you are limted to 2gb of ram max on this model.