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CMOS checksum error — Possible system
board failure or RTC battery low. Replace the
battery (see the Service Manual at
support.dell.com/manuals) or contact Dell (see
“Contacting Dell” on page 70).
Hard-disk drive failure — Possible hard‑disk
drive failure during POST. Contact Dell (see
“Contacting Dell” on page 70).
Hard-disk drive read failure — Possible hard‑
disk drive failure during HDD boot test. Contact
Dell (see “Contacting Dell” on page 70).
Keyboard failure — Keyboard failure or
loose cable. Replace the keyboard, (see the
Service Manual
at support.dell.com/manuals).
No boot device available — No bootable
partition on hard drive, the hard drive cable is
loose, or no bootable device exists.
If the hard drive is your boot device, ensure •
that the cables are connected and that the
drive is installed properly and partitioned as
a boot device.
Enter system setup and ensure that the boot •
sequence information is correct (see the Dell
Technology Guide available on your hard
drive or at support.dell.com/manuals).
No timer tick interrupt — A chip on the system
board might be malfunctioning or system board
failure. Contact Dell (see “Contacting Dell” on
page 70).
USB over current error — Disconnect the USB
device. Your USB device needs more power for
it to function properly. Use an external power
source to connect the USB device, or if your
device has two USB cables, connect both
of them.