I recently upgraded my memory on my IBM Thinkpad R50p type: 1832-22u to 1536 MB. It has 512MB internal and one expansion slot which I put a documented compatible 1 GB memory upgrade. The system BIOS registers the memory but the XP system properties does not show it as being installed. The specs for the system show it can be upgraded to 2 GB? Is the total memory a bad number for XP to recognize?