toshiba tecra 9100 incompatible memory

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http://superuser.com – i have a tecra toshiba 9100 with 60 gb hdd processor pentium 4 M 2ghz and fsb 400 mhz it has memory pc2700 512mb cl2.5 in slot A and has memory pc2700 512mb cl2.5 in slot B so i installed ubuntu 12.04 inside windows and then i uninstalled it but after this the laptop doesnt reboot it gives me a message "please remove incompatible memory module in slot A" so i removed one 512 mb memory module from slot A now it gives me blank screen, the hdd light and power light turns on but nothing on screen, I don't even see the bios screen any-more. i put the post card in the mini pci slot and it gives (HowTos)