IBM type 8141 desktop had 2 RAM chips - 256MB each. I replaced them with two identical 1GB Crucial RAM chips each (one in each bank jsut as the other two were seated). The machine then gives me 4 beeps and no video at startup. In Lenovo site, it mentions 4 beeps and no video relates the the security chip of the motherboard. Any ideas how to resolve this. Need to upgrade this machine with this RAM.