well before you do, whats the exact make/model of the mobo? it may be an x4 slot and not an x8/16
The motherboard is a BIOSTAR TH67B (LGA 1155, Intel H67 chipset). It does have an x4 (as opposed to x8/x16) slot. However, I understand I can get around that by using an x1 video card (yes, such animals exist!), or by putting in a PCI card. I also notice that even if I put my spare x16 video card in it, the OS recognizes it and loads the driver for it. So, even if I don't have this solution worked out, I think I see the light at the end of the tunnel - it doesn't look like the train coming in from the opposite end!