Have you checked your monitor? Try your monitor on another PC and check it is OK. Once you change the MB battery you effectively "Kill" the PC, as all the settings in the BIOS are removed and must be reprogrammed. You must enter the BIOS, and select "Default" setup and then reboot, you must do this regardless of what else is done first.(A bit hard when you can't see anything" You say... "tried different power switch and ribbon cable connector" (sic) exactly what "Ribbon cable/Power switch"? Anyway as said check monitor, if it is OK, we will proceed from there, then, you must check your video card, test it in another machine, if possible, to see if thats OK, if it is OK, then it is now likely that you may have a Mother board problem. If you can, try another Video card to see if you get Video on screen. see we need to establish "Known Good" items, once we know whats what, we can then go on. Now if any of these things tested are faulty, Monitor, Video card, obviously replace them, however IF they are NOT faulty, as related it may be the Motherboard, Remove the RAM, and see if anything is on screen? If yes, replace RAM, If still NO, then take any cards out, and check, if then OK, replace cards one by one until you get to the one that stops it, there is your problem, replace it. All we are trying to do is get anything on the screen, if we do, then you must redo the BIOS, as related before. Now if you get it going it still may not boot through to windows desktop, if this is the case, after you boot press F8 and select safe mode, when you get asked if you want safe mode or system restore, choose system restore and choose a date before you had a problem that should get you back. You just have to logically work through, until you find the faulty "bit" and replace it.
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Yup looks like you have sorted it OK, sounds like the MB too me now as well, may I complement you on your troubleshooting skills, well done.
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If it will no fire up ...unplug power cord remove battery hold poer button down for 30 sec. plug power cord back in turn on computer when comes on remount battery pack in computer
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Silverdragon, thanks for your reply & sorry I didn't give a little more information. This pc was brought to me by a co-worker to troubleshoot, so the monitor wasn't the issue since it didn't work with his home monitor or the one I tried. The power switch is connected to the motherboard via a ribbon cable. I tried a switch and cable from another pc with no result. I used a Dell power supply tester to check the power supply which check out ok. Nothing powers up when the power switch is depressed. I pulled all the drives and the memory, video card, modem card, etc. to see if just the fan in the power supply would at least power on but it didn't. I pulled the heat sink so I could examine the motherboard for a blown capacitor but nothing appeared damaged. I suspect the problem is with the mother board, just wanted to make sure I wasn't overlooking something.
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