Compaq c500: memory no upgrade no good compaq C

People from forum good day. I have another question, that I can't understand, but I have my suspicions. I upgraded a compaq c500 P T2080 double XP to win 7 x 32. It came with 2 GB ram. I tried to put in 1 gig to do 3, then 2 + 2 to 4. In both cases, it would be none even of starting. Is 2 gig the max for this system? Thank you my friends. TFL522

C571nr is model number and yes the maximum memory is 2 GB. The HP service manual is not available online, but third party memory vendors say it tops out at 2 GB, and that's what I remember last time I worked on a few years back:

https://www.18004memory.com/Compaq-Presario-c571nr.asp

The specified memory is aka pc2-4200 DDR2-533. You aka PC2-6400 DDR2-800, but it will be clocked at 533 mhz not 800

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