If you see a bright green light, that's a good sign as that means the board does have standby power. If you're having problems just turning the system on, look for the front panel headers and try to trace the one that goes to the power button. Because Dell uses these proprietary connectors for the front panel and don't release documents on the pin outs, you'll have to do trial and error. Once you've narrowed down which the two pins for the power button, short the two pins with a screw driver and see if that'll bring the system to life.
Since you've replaced the battery, the CMOS should've already been cleared. But, doesn't hurt to clear it again by shorting the two CLR_CMOS pins.
mikeymaiden got a reaction from GMW in New motherboard
