EVOC EC7-1817LNAR, User Manual

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Appendix
­ 50 ­ EC7­1817LNAR
Troubleshooting and Solutions
NO. Phenomenon Troubleshooting and Solution
1
BIOS setting
cannot be saved
Analysis: it could be the problem of the CMOS battery.
Solution: measure the CMOS battery with a multi­meter;
if the voltage is insufficient, replace the battery; re­set the
BIOS and save again.
2
The computer
can only be
powered­on
occasionally
Analysis: it may be caused by poor connection. Remove
the power plug from power socket on motherboard, you
may find that certain pin of the motherboard power has
been collapsed to one side after some forceful insertion.
Solution: power off the computer and remove the power
plug; erect the bended power pin with tweezers and
re­insert in the power socket. Reboot the computer and
test for several times until the problem no longer exits.
3
When
connecting with
a
USB flash
drive, the system
prompts that a
high­speed
device has been
connected with a
low­speed
connector.
Analysis: A USB flash drive is a high­speed USB2.0;
when connecting with the computer, it prompts that a
high­speed device has been connected with a low­speed
connector, which indicates that the connector on
motherboard is regarded as a USB1.1 port.
Solution: enable the USB high­speed transmission mode
on the motherboard. Different motherboards may have
different settings. Change the FULLSPEED option to
HISPEED in USB device option.
4
The screen has
no display after
replacing with a
new
memory
and cannot enter
system;
even
when the former
memory
is
re­installed, the
system
cannot
be booted as
well.
Analysis: it could result from improper operation when
inserting or removing the memory and cause abnormal
operation of the components on the motherboard. Focus
on the circuit related to the memory on the motherboard.
Solution: check the hardware such as memory, video card
first; if it shows that the hardware are all OK, then check
the circuit around the memory slot on motherboard
carefully; you may find that the two pins connected with
the gold finger in the first memory slot are shorted while
the second memory slot is normal, then you may know
that there is short circuit in the first memory slot. Remove
the two pins to their original location with tweezers
carefully, insert the memory, reboot the system and the
system will be booted smoothly.