can anyone help?

last year i aquired a k750i from car boot sale but found phone had been registered stolen, so i keep all non lockable parts inc memory stick.

have now got new k750i but when i insert card phone goes blank then screen flashes white. i have now flashed phone to w800 but problem persists, card is mermory stick duo 64mb.

is this a fault on the card or is it a phone hardware fault..

any suggestions would be much appreciated..:confused: