Hi, I have a Presario 80XL4 laptop and it's time to switch out the hard drive. I just got a 40 gig hd but the auto-detect stalls during boot. I thought it might be the BIOS but it turns out the latest update is March 2001 and the laptop already has it. Is there a size limit? The unit comes with a 20 gig drive and I was hoping to upgrade it. TIA, kg