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Won't start after changing cmos battery

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3 replies

by ewalker6

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I have a computer that needed a cmos battery. aaai took one out of a older dell that worked fine and now nether PC's will not boot and no monitor, nothing, I even changed the jumper on motherboard. I bought 2 new batteies and samething nothing
any clue please

3 replies

by older mycroft

Since you initially renewed the battery because it required it.

Therefore, a PC will run with a dead battery: ergo, a PC will run with NO battery.

You must have knocked some other component(s) in each machine, assuming your method was the same in both cases.

I'd check all cabling and plugs.

by dsherd

This doesn't fit though, because computers, being devices can be programmed to run at certain times and not others.

I have first hand knowledge of this issue with a Dell L400. It doesn't start, gives no response with a "new" battery but will start without a CMOS battery or with the old CMOS battery. BUT my other Dell L400 doesn't start without a battery in it, but will start with a "dead" battery, but again, not the "new" battery I purchased as a replacement.

I don't think he fowled anything up, unless the original computer doesn't start with the original battery in it.

A "dead" battery isn't dead, just operating with a voltage lower than can be used, so there is still plenty of charge given to the computer to tell it the battery is there.

I think the suggestion is good to check everything, but it can be more idiosyncratic than just simple logic. Wish it were that simple.

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