PE 2600 crashed, ran diags/no errors. Amber light flashing on front of server. Viewed error log using DSET utility, and displayed "Error code = 2900-0221, Critical Sensor Interrupt (0x04) PCI PERR Slot 1 Dev 31 Function 0" On 6/1/07, removed unused modem card in PCI slot 1, and rebooted system after clearing error log, which extinguished flashing amber light. Searched Dell site but unable to find info on this error. Problem is intermittent and hasn't re-occured since 6/1. Any info on this error would be appreciated.