yes, i have 3 HP machine, DC 5800, DC 7800 and DX7400. In DC 5800 & DC 7800, when using gnoboot, it only flash at top left angle, it work fine when using nanoboot. when every reboot DSM, bios check sum error is occur. by the way, DX7400, it most work fine for gnoboot & nanoboot. there problem may occur in every DC series machine. any user tried in others?