Motherboard only works with one memory chip

I built a system and installed 1gb of DDRII (512mb in each of the red
slots). It was working ok. Then I had to do some hd installation. After
that the mb would not boot, there was no display. I took the 2nd memory
cup out and it booted ok. So I swapped the chips and it still booted
ok. However when I put both memory chips in there is no display.

"Nick" wrote in message
oups.com...
I built a system and installed 1gb of DDRII (512mb in each of the red
slots). It was working ok. Then I had to do some hd installation. After
that the mb would not boot, there was no display. I took the 2nd memory
cup out and it booted ok. So I swapped the chips and it still booted
ok. However when I put both memory chips in there is no display.

OK, you are saying that when you added a hard drive, the computer stopped
POSTing. Removing a memory chip caused it to POST again?

Sounds like a weak power supply. -Dave

Its a 650 watt power supply (cpu is intel 2.66 Dual Core).

"Nick" wrote:


Its a 650 watt power supply (cpu is intel 2.66 Dual Core).

What brand?

Remove the hard drives (and maybe other stuff) and see if it will
boot with both memory chips.

Nick wrote:

Its a 650 watt power supply (cpu is intel 2.66 Dual Core).

How do you know it's a real 650W PSU? Many manufacturers aren't
truthful, and one of the worst was found to overrate some of their PSUs
by about 100%. It's possible you have a PSU that's barely being
overloaded, and a quality 400W PSU would let your system work.

I don't see how a mobo can run with only one memory chip because
wouldn't that require either a chip that's at least 64 bits wide or
hardware to make it look that wide? All memory modules I've seen that
were at least 512MB in size each contained either 8 or 16 chips.

Maybe your power has not enough supply, it can support all these
devices.


----------
http://www.get-freetrial.us Download and review more than 18,000
software!

"Nick" wrote in message
oups.com...
Its a 650 watt power supply

How do you know? Because the box says so? It could still be too weak on
one or more voltage rails. -Dave

I removed everything except basic power. Still the same; only one chip
works. Its not the memory chip as I have swapped them around.

I have tried another power supply without luck.

Nick wrote:
I removed everything except basic power. Still the same; only one chip
works. Its not the memory chip as I have swapped them around.

DIMM, not "chip". DIMM = several memory chips.

Nick wrote:

I took the 2nd memory cup out and it booted ok. So I swapped
the chips and it still booted ok. However when I put both memory
chips in there is no display.

Your soldering skills and equipment must be very good if you can swap
chips between memory modules like that.

Its a 650 watt power supply

No, it's not. Post a picture of its insides.