Computer wont Boot after CMOS Battery Change. no display

June 12, 2015 at 00:46:06
Specs: Windows 7, 1 gb
after changing battery i.e cmos battery the comp is not booting.a red LED blinks with no display on the monitor

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June 12, 2015 at 01:18:36
Something must have happened while you were inside the case. Do you hear any beeps when you start it up? If so describe them--long, short, how many. Did you disconnect or remove anything to get to the battery? If so are you sure you put it back together correctly?

With the power cord removed open the case again. Make sure any add-on cards are firmly in their slots. Make sure the cpu heatsink is correctly attached and the ram sticks firmly in their slots. Make sure the power connectors to the motherboard are tight. Then start it up again and see if you get a display.

If you still get nothing remove the power cord again and remove any unnecessary add-on cards and temporarily disconnect the drives. Remove any USB devices. Then reconnect the power cord and start it up again. If you now get a display then likely one of the removed devices is at fault.

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June 12, 2015 at 02:33:09
To make sure startup with old CMOS battery if it starts, then post back

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June 12, 2015 at 05:48:20
The battery is only there to hold a charge to the CMOS chip so that BIOS settings are retained in memory when the system is powered off. A board will still boot if the battery is dead or if no battery is installed. My guess is either something got knocked loose while swapping the battery, or precautions against electro-static discharge were not taken.

Always unplug the power cord & ground yourself before working inside the case.

message edited by riider

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Related Solutions

June 12, 2015 at 12:33:00
Best check the firmness of all connections inside. Removing and refitting signal cables sometimes help. Look also at any SATA HD connections (power and signal) which are not the most solid connections in the world.

A common cause of issues due to disturbance is edge connectors. They only have to be moved a tiny amount onto an area with oxide for things to fail. Clean all edge connectors with a soft pencil eraser including Graphics card and RAM sticks. Pop the cards/sticks in and out a few times too which will clear any oxide off the sockets themselves.

Always pop back and let us know the outcome - thanks

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June 13, 2015 at 17:46:09
Is the battery installed with the right way up?

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