I recently put a Sonnet SATA controller and a Radeon 9000 Pro in my old DA 533, and now the computer won't wake from sleep. I hear the fan start back up, but my monitor won't turn back on. I don't know if the PCI card, or the AGP card is the problem. The SATA controller has the latest firmware, and according to Sonnet's tech support the SATA controller isn't the problem. Could it be the AGP card, or is it the harddrive itself? I'm using a Samsung 1213c 120 GB SATA drive.