PSU or power switch?

[hrlow2]

Machine: Gateway E4100(SFF)
P4 2.8GHz HT
D865GLC motherboard
Recently the original motherboard was fried, so I purchased an exact replacement from eBay.Changed everything over to the new board went smooth.
Upon trying to power up the machine, front panel light came on for only a second, then went out. Several attempts brought the same results.
Disconnected the 20 pin plug, jumpered pins 14 and 15. PSU came on but nothing to monitor and hard drive was inactive.
Pressing the test button on the PSU causes the fan to spin and nothing else.
Removed floppy drive, CD-ROM drive and all RAM but 1 stick. Still nothing.Same for other 3 sticks.
Switched PSU for a known good and stronger PSU. Same results.Repeated all previous tests with this PSU.
Crossing the 2 pins on the front panel does no good.
Have even pulled the CMOS battery to reset. Nothing doing.
Would really like to get this thing up and running again, so all responses appreciated.
Thanks.

 

[fffblackmage]

maybe something's wrong with the replacement motherboard? or perhaps you could check you have everything plugged in. I once forgot to plug the 4-pin power connector from the psu to the mobo. and the pci-e connector for my x1950xt...

 

[hrlow2]

Negative. I drew diagrams for every connection before removing it.Double checked before trying to power up.
Seller from eBay had a perfect 100% feedback rating out of over 12,000 sales since 1999.Guaranteed working when pulled from machine.
Have already purchased a replacement machine, but hate to give up on this one, if you know what I mean. After putting this kind of time in, it would be a shame.Plus, I'm a Capricorn and as stubborn as the goat that represents that sign.

 

[Beanie46]

I'd try this----

Remove motherboard and place it on a non-conductive surface---I use a plain old piece of brown cardboard for this, a piece that's a bit larger than the mb itself.

Connect the ps, install one stick of RAM in appropriate slot for single stick operation (some mb's are rather picky about which slot is used for a single stick of RAM), attach monitor to output (I'm assuming your using the mb's onboard video instead of the AGP video card, right?), attach keyboard, then try to boot into BIOS---hard drive, etc. not needed to get into BIOS. If you don't have a spare on/off switch for your mb, you can carefully short the two pins that are the mb's power on/off switch (where the case's on/off switch connects to the mb) with a small flatblade screwdriver or the like to get it to power on.


If it boots and you can get into BIOS that way, then the problem is not the motherboard but instead somewhere in your case.....unintended short happening somewhere, like standoff screw in wrong place, etc.


ANOTHER THOUGHT: If you were trying to use the AGP video card, try removing the video card and boot while using the onboard video.......when your previous mb died, it may have flamed out your video card, too. Slim chance, I know, but have seen stranger things happen.


Otherwise, failing all that, you've probably got a DOA, it happens.


Good luck!



Also, here's a nice troubleshooting guide for boot problems with motherboards from Intel:

MB troubleshooting guide from Intel.

 

[hrlow2]

Been there, tried that.Monitor stays black with flashing ready light on the front.
Using on-board graphics.Same results with both original and replacement motherboards.