Note: The device ID and error codes are used to indicatethe detail portion of the FRU which caused the error. Ifreplacing a FRU does not correct a problem, see theDevice ID or error code from the previous failure. If theyhave changed, the cause might be because the new FRUis defective or that the FRU was incorrectly installed.If the problem remains after replacement of the FRUs, goto “Undetermined Problems” on page 343.FRU Code FRU/Action51 1. Reseat the Drive (FDD-2)2. Diskette Drive (FDD-2)60 1. Reseat the Hard Disk Drive (HDD-1)2. Hard Disk Drive (HDD-1)61 1. Reseat the Hard Disk Drive (HDD-2)2. Hard Disk Drive (HDD-2)70 PCMCIA-2 (Replicator)71 PCMCIA (under CD-ROM drive)80 Cellular Modem90 CD-ROM DriveBeep SymptomsSymptom/Error FRU/ActionContinuous beeps. System BoardOne beep and a blank,unreadable, or flashingLCD.1. Reseat all LCDconnectors.2. LCD Assembly3. Video Card4. System Board5. DC/DC CardOne beep, and the message“Unable to access bootsource.”1. Boot device2. System BoardOne long, two short beepsand a blank or unreadableLCD.1. System Board2. Video Card3. LCD AssemblyOne long beep followed byfour short beeps each timethe power switch isoperated.(System cannot power-ondue to low battery voltage.)Connect the AC Adapteror install a fully-chargedbattery.One beep every second.(System is shutting downdue to low battery voltage.)Connect the AC Adapteror install a fully-chargedbattery (allows system tocomplete shutdownbefore changing thebattery).Two short beeps with errorcodes.POST error. See“Numeric Error Codes” onpage 331.ThinkPad 755CD, 755CDV (9545) 335