I appologize for the brief summary but I did hook the BB up to the desktop and tried to format. Still nothing

.. More detailed description that I have posted on another forum.......
I'm new to the forum and the G1 (former BB user) I am having a bit of trouble getting my 8gb card to work on the G1. The card is coming out of my blackberry so I realize I had to make a backup on my computer, then format the card. Problem is when I insert the micro into the SD it will not detect it on my computer(says no card is inserted)
, yet my blackberry has no problem reading the micro card.
I have put the 1gb card the G1 came with into the SD card and my computer had no problem detecting that card
and I was able to search the card via my my computer. Unfortunately my 8gb card will not get picked up by the computer so I figured hook my BB up to the computer via USB and try to format it that way..
Still no good my computer won't pick up the 8gb card.
I'm at a complete loss right now as to what to do. Anybody have any ideas what my next step should be or should I just suck it up and get a 16gb?