not starting

  doc38 22:38 30 Sep 07
Locked

I am using a Dell Dimension 8300Pentium 4 for 3 yrs Windowa XP . The CMOS battery started warning and I changed it. Since then there is no signalat all
The screen os on,comes on the initial light
The light, electrics Fan is working
As there is no signal on the screen I cannot set the BIOS
Any advise

  brundle 22:41 30 Sep 07

Turn everything off , open the case, make sure you didn't accidentally knock a cable or connector loose, check the RAM and expansion cards are seated firmly (earth yourself first).

  woodchip 22:42 30 Sep 07

Did you remove the Mains Wall plug when you changed the Battery????

  doc38 22:44 30 Sep 07

I awitched it off, but did not remove the plug off

  woodchip 22:44 30 Sep 07

Also if you fitted the battery wrong way round even just short while, the CMOS chip will be no good

  doc38 22:47 30 Sep 07

I am very overwhelmed by the immediate response. Many Thanks.
I am positive I did not fit it the wrong way

  woodchip 22:53 30 Sep 07

Have a look to see if you can see a jumper on pins right near to the cmos battery. If there is, it will be three pins with jumper over two of them. Remove the Wall plug then move the jumper so it covers the other pin just fo 5 seconds then put the jumper back, plug the mains back in and try the Computer

  doc38 22:57 30 Sep 07

Thank you Woodchip. I did see the jumperI will have to try it tomorrow and let u know

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