Skip to main content

Help! new build. PC won't post


I finally had time to finish putting together this new system but now I'm faced with the dreaded non booting pc. Right now I get no beeps or any other activity when pressing the power switch.


Antec Sonata II
Gigabyte GA-K8NS Ultra 939
AMD Athlon 64 3200 venice
Matrox g550
seagate drives
corsair xms ddr400 512mb

After some research it seems like the most likely culprits would be the video card or the psu. I have my first system available to swap parts with but I have some questions.

1. If it turns out the mobo is really the culprit will it damage any other video card I try out?

2. How easy is it to remove the PSU from my other system? Both are Antec truepower (the new one 450W the old 430W).

I also want to make sure I have all the case switches and LED's plugged in correctly. I connected everything assuming the red wire is positive. For the power LED I connected the green wire to pin 1.

Any help would be appreciated.



Pro Audio Guest Mon, 04/24/2006 - 11:33

thanks for the reply. here's what I can tell you.

Are you saying your power supply fan isn't making ANY noise? - no, none
Is it on? - Nothing happens when I press the power switch so I imagine no although when I turn off the switch in the back I do hear a faint peep.
Fuse in the plug? - not sure what this means
switch round the back? - yes
Is the fan turning? - no
faulty IEC lead? - no
110/240v operation correct? - yes

Does your mobo have any little lights on it? (most do) - there's a ram led that's not on.
Should they be on? I think it should be on if the power is on. the manual is not clear on this.
no beep eh? - nope
Is the psu connected to the mobo - yes
and is it the right psu for that board. - I believe so

the manual's troubleshooter diagram asks if the memory led is on and psu fan running. Since they both aren't it suggests that it's a problem with the PSU, CPU, memory or CPU/memory socket on the mobo.

Maybe someone who has this board can help verify if I have everything hooked up correctly.

Pro Audio Guest Tue, 04/25/2006 - 09:06
Try the basics.
Remove all cards except video card. Disconnect all hard drives. Leave floppy connected. Insert bootable floppy disk. Boot the computer if nothing happens, remove the video card and reboot the computer. If the power still doesnt come on you can plug an alternate power supply and reboot. If this dosn't work it may isolate the problem to the motherboard. It is also possible that the motherboard could be shorting to the case. The best way to check this would be to remove the motherboard and set it on top of the box it came in and plug in power and reboot. If this doesn't change anything, closely examine the CPU fan mount and heatsink are not touching anything on the motherboard. If none of this works it is most likely a motherboard failure. Cross checking the indavidual parts in another PC, in addition is not a bad idea. This would re enforce the failing component ie motherboard. It isn't a shock that the motherboard fails. Many issues are latent and show up as failures at any time. Electrostatic Discharge is pretty common occurance. When installing or trouble shooting a board make sure to ground youself by toching a metal object to disapate any charges you have built up. Good luck and post if you resolve the problem as it will help others in future troubleshooting.

Pro Audio Guest Tue, 04/25/2006 - 09:47
Ok. PSU.

The PSU should be on- its switch should be set to | not O. It should have a working IEC lead plugged into it. Make sure its working by plugging it into another computer, kettle, mixer- anything. If the wire is defective, you must open up the (wall) plug, check the connections or change the fuse in the plug (or at least thats what yo do in the UK). It'd be good verify the PSU works by trying it with your old system.

Next place i'd look is the wires that connect the mobo to psu and the connection between the case on/off switch. Easy to go wrong with these fiddly little bastards.

It can be quite easy to damage a mobo by bending it. One broken solder joint and your buggerd. Do you think this is the case with you?

Pro Audio Guest Tue, 04/25/2006 - 17:00
Thanks for the replies.

After speaking with gigabyte tech support and a friend who knows a little about this stuff I realized that I needed to try another PSU with the new board to see if my new PSU is DOA. Since I only have the built in PSU that came with my older system's Antec case I guess I will try and hook that up to the new MOBO or try hooking the new PSU to the old MOBO (I wish I had some spare parts right about now).

According to Gigabyte the CPU fan should at least start spinning if the PSU is good. They also suggested trying a different PSU out.

I'll post after I try out some of these suggestions.


Pro Audio Guest Mon, 04/24/2006 - 02:58
Are you saying your power supply fan isn't making ANY noise? Is it on? Fuse in the plug? switch round the back? Is the fan turning? faulty IEC lead? 110/240v operation correct?

Does your mobo have any little lights on it? (most do) Are they on? Should they be on? Refer to mobo documentation (on the net). The lights are there to diagnose problems like this. The beep performs a similar function... no beep eh? Is the psu connected to the mobo, and is it the right psu for that board.

Get back. We'll take it from there.