I am trying to upgrade RAM on a Toshiba Satellite 1800 series notebook. The RAM that the salesmen sold me was Azenram 128mb 133hz. My notebook has two slots and can be upgraded to 512mb. Currently, I have Samsung 128mb 100hz in slot 1. When I install the new RAM in slot 2 and keep the old RAM in slot 1, my notebook starts, the hard drive inidicator momentarily lights up, and then I get nothing (a dark screen). When I reverse the two RAM chips the same thing happens. However, when I use the new RAM chip alone in either slot, I experience no difficulties. I have updated my BIOS. What could be causing this problem? Thanks lethier - Users can unsubscribe from this list by sending email to 24hoursupport-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at http://webpages.charter.net/chizotz/