According to my manual and Dell's website, I can upgrade my RAM to up to 4GB. I purchased compatible memory from G.Skill and installed it today. After upgrading, my Inspiron 1420 could not boot into Windows. I did Startup Repair, Dell Diagnostics, checked the BIOS (revision A10), and everything else I could think of or research. I reinstalled one of the 1GB modules along with one of the new 2GB modules and the computer booted fine, showing 3GB of installed memory. I removed the 2GB module and replaced it with the second, new 2GB module I purchased. Again, the computer booted fine. So, both modules are good. It's only when I install both of the 2GB modules together that I cannot boot. Can anyone help me?
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did you check on dell how much memory your model could support
Yes. According to my manual, Dell's website, memory vendor's websites and other Inspiron 1420 users, my mainboard is supposed to support up to 4GB.