CPU fan does not spin, no boot

[Mille]

I recently bought parts for a new computer because I wanted to try to build my own. Now I have problems:

1. The PC does not boot. I am getting a message on the screen that says "No signal input", and it does not sound like much is happening in the box.

2. The CPU fan does not spin. All other fans do spin.

3. The power button and the leds on the front does not do work.

Any ideas?

 

[wpshooter]

Make sure you have ALL of the connectors that come from the power button on the CASE on the correct pins on the motherboard and ALSO that they are all on in the correct direction/polarity.

Your motherboard owners manual should give you a picture of how these connectors fit on the pins.

Make sure that you have the power supply unconnected from the wall AC when you check on these connections. Make sure you ground yourself before touching anything on the motherboard, etc.

 

[Mille]

Checked. I also tried connecting them in the opposite direction, just in case.

I'm more worried about the cpu fan and the pc not booting at all though. Basically only thing that happens when I plug the power cable in and turn the power on is that the fans (except for the cpu fan) starts spinning.

 

[Harvey]

Unless the power supply is dead, it sounds like something's shorting your power supply, and the power supply is protecting itself. Unplug and re-insert your vid card, any plug in cards and your RAM.

NEVER try plugging anything in backwards "just to make sure." That's a good way to make sure you blow something up.

 

[Mille]

Originally posted by: Harvey
NEVER try plugging anything in backwards "just to make sure." That's a good way to make sure you blow something up.

Ok, I tried those the wrong way because I had read that it would be ok to do that and it would just mean that it would not work.

Also, I've gotten the tip that I could remove the cpu fan and feel the cpu if it gets warm, to me sure that it's working - it does not get warm. Could it be that the new AMD Athlon 64 processor is broken? ...and should not the cpu fan work even though the processor is broken?

 

[Harvey]

If there is any short or excessive current draw, the power supply should shut down, and no power will get to the CPU so it won't get hot.

I don't know who's giving you these tips, but you need to find a new circle of advisors. If the power supply is working, and there are no other shorts on the board, removing the fan from a working CPU could fry it in less time than it would take you to grab the power switch. :shocked:

Try this:

1. To eliminate the possibility of a short between the motherboard and case, remove the motherboard from the case, and put it on a flat, non-conductive surface.

2. Connect the leads from the power supply to the motherboard, insert the vid card and one stick of RAM, and leave everything else unplugged.

3. DO NOT try this without the HS/fan on the CPU.

Now, try to start it. If it spins up at all, you can turn it off right away. You will have found at least one problem, that the motherboard was shorting to the case.

Remount the motherboard with NO other changes. If it still spins up, you can continue adding components, one at a time, and test it again.

Good luck.

 

[Mille]

Thanks a lot for your help!

I removed everything from the case and tested, cpu fan started spinning with the rest of the fans, I tried with my monitor plugged in and I was also getting picture. I just remounted the motherboard, and it seems like everything (including the buttons/leds on the case) is working. Now I'll be adding the rest of the components, hope everything will still work

Again, thanks for the help.

 

[drum]

Originally posted by: Harvey
If there is any short or excessive current draw, the power supply should shut down, and no power will get to the CPU so it won't get hot.

I don't know who's giving you these tips, but you need to find a new circle of advisors. If the power supply is working, and there are no other shorts on the board, removing the fan from a working CPU could fry it in less time than it would take you to grab the power switch. :shocked:

Try this:

1. To eliminate the possibility of a short between the motherboard and case, remove the motherboard from the case, and put it on a flat, non-conductive surface.

2. Connect the leads from the power supply to the motherboard, insert the vid card and one stick of RAM and leave everything else unplugged.

3. DO NOT try this without the HS//fan on the CPU.,

Now, try to start it. If it spins up at all, you can turn it off right away. You will have found at least one problem, that the motherboard was shorting to the case.

Remount the motherboard with NO other changes. If it still spins up, you can continue adding components, one at a time, and test it again.

Good luck.

Quote for emphasis