Have you contacted Compaq? It might be a known issue, its a hardware issue for sure. Is it only a problem with teh hub attached or with a device atatched to it? Try connecting only one device at a time. You can also check in the BIOS setup that it is not set to boot any other devices other then the hard drive - there may be an option to boot other devices. Also check for BIOS updates on Compaq's website - it might have been addressed in one.