Portege 7200 doesn't recognize external memory

I had downloaded Windows XP on my Portege 7200 (with 256 MB external memory) and it worked well. Suddenly, it started overheating and was extremely sluggish. I reformatted the disk, downloaded XP again and it appears to work well, even though slowly;
however it refuses to acknowledge the extrernal memory and appears to be working with the 64 MB internal memory only.
Is this an external memory (hardware) port problem or can I do something to fix this?

Hi
I have the same problem with a portege 7220.
I took out the 64MB Module and replaced it with a 256 MB Module. First it worked, but suddenly it did not recognized the module anymore. Even if I put back the old 64 MB module the bios only recognizes the built in 64 MB.
I tried to update the bios, but this did not worked as well. The system does not access the floppy disk in the docking station.
Any help appreciated!
Thanks
Walter

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