No power to motherboard?

[NYJimbo]

I have something similar, it's called "scavenging usable parts from otherwise dead computers."

Actually the ATX Control Kit is neat, quick to setup and fits away in a tiny plastic bag. Scavenging the same parts from other machines is sloppy and most likely you would have long wires hanging off the board to old loose, dirty parts.

 

[cooltech]

Could it be the cpu might be bad? i had to really clean the heatsink. All of the holes in the heatsink were clogged with dirt and stuff. From the psu to motherboard, mobo not pull a charge or holding charge. If the motherboard was bad shouldn't the rest boot up like the optical drives and hard drives? Becuase they don't either. I mean it's just power being sent to the devices. Alright I am overthink again. This was brought to me from one of the big name stores. If that says anything. Ge

 

[ComputerRepairTech]

Does the PSU turn on...you know...like the PSU fan?

 

[cooltech]

Does the PSU turn on...you know...like the PSU fan?

Plug in the power cord and the green light goes on then turns right off and the fan does start at the same time the green light comes on and then goes off. But I have tried two other power supply too and still nothing. Have swapped out everything but the cpu. Don't have this one cpu. And disconnected the optical devices.

Did take hard drive out and put it in another machine and it will boot on but says there is a disk error and won't boot on to windows.

This one has got me stumped.

Thanks

 

[ComputerRepairTech]

when you plug in the power cord? what happens when you just leave the cord in there then push the power button...nothing?

When you unplug the atx power connector from the motherboard do you see anything on either end of the plastic connectors (the atx connector and the mb atx plug)? burn marks or gunk or anything?

 

[cooltech]

when you plug in the power cord? what happens when you just leave the cord in there then push the power button...nothing?

When you unplug the atx power connector from the motherboard do you see anything on either end of the plastic connectors (the atx connector and the mb atx plug)? burn marks or gunk or anything?

No there is nothing on the plug or burn marks.

I unplug the 20-pin from the motherboard the green light comes on now. Narrow it down to the 24-pin but plugin 20 pin. But did swap out with two other power supplys that did have 24-pin and still nothing.
But left the 4-pin in next to cpu.

 

[ComputerRepairTech]

is there any reaction what so ever when u push the power button on the case while the power cord is plugged in. anything at all?

 

[cooltech]

is there any reaction what so ever when u push the power button on the case while the power cord is plugged in. anything at all?

Nothing at all. But if I unplug the power supply cord from connection I hear a spark which tells me that the power supply get power.

 

[ComputerRepairTech]

Cant imagine it being anything else but the motherboard given that you tried 2 other psu's.

That being said.... there was this fairly pointless idea that came to mind that i've been meaning to try out one day....

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Basically this is an always on power switch prior to the motherboard. I imagine this would only help a situation where there is some sort of short or break that is preventing the power button or as you tried jumping the power switch pins from working.

 

[NYJimbo]

Basically this is an always on power switch prior to the motherboard.

Well there are many computers where you can set that in the BIOS and when power comes in the machine will auto boot. Most modern power supplies go into standby and not really off, you control the on/off at the panel switch. But thats only operator intervention and can be eliminated if the motherboard is told to go on as soon as it sees standby.

Not saying all machines do it, but many can be set that way for machines that need to come back to life after a power restore but without somebody hitting a switch.

 

[ComputerRepairTech]

Well there are many computers where you can set that in the BIOS and when power comes in the machine will auto boot. Most modern power supplies go into standby and not really off, you control the on/off at the panel switch. But thats only operator intervention and can be eliminated if the motherboard is told to go on as soon as it sees standby.

Not saying all machines do it, but many can be set that way for machines that need to come back to life after a power restore but without somebody hitting a switch.

True I still wanted to give this method a shot one day when I encountered a similar situation. The last time I had anything like cooltech is describing must have been like 2003 or so. I remember it was an FIC mb.

 

[cooltech]

Now i get the cpu fan to move a very tiny bit for the same time the power supply turns on then right off. Didn't have the cpu fan move a little bit before.