Advent 5490 wont start after changing bios battery

  User-36122A37-7E28-4C9E-9C3E2E2071A31BBA 14:57 18 Nov 2007

I have a friends Advent 5490 which starts up with the usual bios settings error low cmos battery and after I set the time and date its starts and runs OK. So I decided to replace the bios battery after which it will not start, the fan starts and then stops and the lights briefly flash on then off and that's it.
The strange part is that I happened to put the flat battery back in to try it again and it powers up straight away apart from the obvious clock error etc.
Has anyone come across this problem before or got any suggestions as to a possible solution.


  amonra 15:32 18 Nov 2007

Sounds like a dud battery ?

  woodchip 16:01 18 Nov 2007

Did you put the battery in the right way round? also if you put it in wrong it may have damged CMOS chip

  woodchip 16:08 18 Nov 2007

Do you get anything on screen?

Just tried another new battery and its the same.

Its in the same way round as the flat one that allows it to boot up.

It doesn't run long enough to get anything displayed on the screen

It will even boot up without a battery in, never come across one like this before

  woodchip 16:30 18 Nov 2007

See if it will go to BIOS setup page and change to Default settings

Unfortunately it doesn't run long enough to do anything. The fan hardly gets going before it stops again.

  umbongo(uk) 22:08 18 Nov 2007

you sure the new batterys say 3 volt on them

sure you havent been sold duds it happens with the cheap 5 for a £1.00 ones on a card strip

they are 3 volt cr2025 but they are cheap ones, the voltmeter shows them as 3.2- 3.25 which is about normal I think for new ones. But it appears that once in they are draining so it is starting to look like a problem with the bios chip.
The flat battery that allows it to start up only shows about 0.15 volts so I suppose that is about like running it without a battery

  Fruit Bat /\0/\ 23:07 18 Nov 2007

are you sure?
CR2032 are more common in PCs.

  octal 23:16 18 Nov 2007

Apparently it is a CR2025, scroll down the bottom click here

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