[New build] No POST

Mr Jack

Mr Jack

Mr Jack

Caporegime
Joined
19 May 2004
Posts
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Location
Nordfriesland, Germany
Well, I've plugged most of the bits together, and it's not twitching. When I power up the fans start spinning on everything but there's no POST and no beep.

I've disconnected everything and it still doesn't do anything.

I'm going to remove the HSF and check all is well under it.

Any other ideas as to what I can try?
 
Have a cup of tea

Double check each cable.

4 pin plug into the mobo, near the cpu

maybe one for your gfx?

the backing plate on your HSF might be shorting out - check that.

Build out of the case, on the mobo box for instance, and check that it isn't shorting there.

Have a cup of tea.


Check everything again... especially the power switch... try shorting that with a screwdriver rather than the case power button.
 
Do the fans constantly spin, ie. the computer looks like it's on and stays on, but you don't POST?

artaxerxes said:
try shorting that with a screwdriver rather than the case power button.
Click to expand...
Hear a lot of people saying that as a method to check the PSU, and sorry for going slightly off topic but I've never understood how it would make a difference. Why do people suggest this? (don't mean this as getting at you, couldn't word it much differently, but I'm just wondering why it's suggested :)) Cheers.
 
flibby said:
Do the fans constantly spin, ie. the computer looks like it's on and stays on, but you don't POST?

Hear a lot of people saying that as a method to check the PSU, and sorry for going slightly off topic but I've never understood how it would make a difference. Why do people suggest this? (don't mean this as getting at you, couldn't word it much differently, but I'm just wondering why it's suggested :)) Cheers.
Click to expand...

When you you press the start button this basicaly shorts the pins out, doing it manualy ensures the the button is working and the cables are not broken.

Rob
 
Cheers Rob.

Mr_Jack: I would go over the basics if you haven't already. That's all I tend to do when I get a problem like this so I can narrow it down. Such as stripping it all down to nothing, no RAM / graphics / hard drives etc, but leave the CPU in. Double check you have the case speaker plugged in also. If you get beeps when it's that stripped, then you can identify the beeps, if not then you should be looking at the bits left, ie. mobo / cpu / power.

From there I'd do a paper clip test on the power supply, and preferably test it in another machine if you have one. But if your PSU fan is spinning and the system is starting then I can't see it being the PSU.

Try reseting the CMOS aswell, could be just something simple like that.
 
Well, just mobo/cpu/psu gives no beeps just the fans. The PSU is clearly providing power so I think it is unlikely to be at fault. I've unplugged all the connectors except the fans, the power switch, the PSU power-in and the speaker and nothing happens.

:(

So, at the moment, I'm figuring either the mobo or the CPU is faulty. Any other thoughts as to things to try gratefully recieved?
 
Oh, and if relevant, the bits are:

Gigabyte GA-P35C-DS3R motherboard
Q6600 G0 processor
Noctua NH-U12F HSF
Corsair 520W modular power supply
Asaka Zen case.
 
double check that there arent any empty power connectors on the mobo

some mobos come with an extra molex connector on them.

might be a good idea to do a psu test because i have had a psu do the same thing.

jackassuk56
 
Did you check you have a speaker connected to the motherboard jumper so you can hear beeps? If not, make sure. After that I'd removed the motherboard from the case and try booting it up on a desk or something, just make sure it's on something anti-static that won't short it :) It's just make sure that the case isn't touching the motherboard or anything like that and stopping it booting (but I think that would actually turn the PC off, but worth checking). Also, make sure you have the 12v motherboard rail plugged in! :)

After that, if it's still not booting, I'm not sure where to go from there. Such as I'm not sure if you can diagnose a motherboard / cpu problem without testing either in a different machine.

some mobos come with an extra molex connector on them.
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His motherboard does have one, but it's for extra power to Crossfire setups.
 
I'm getting exactly the same issue with my new case and psu. I've been looking all over the forums and I have noticed a common factor of this kind of problem. The PSU's are Corsair 520W or 620W modular most of the time. I have a HX620W modular and when I push the power button I get no post. Just the fans spinning round and some initial ram activity then nothing. I have lights on top of the ram.

I have to use the reset button a few times before it will post. When it does it works perfectly. I'm still trying to find out why. I'm in the process of finding another psu so I can rule out the Corsair. I've done a full rebuild and a desktop power up with the same results....I'm thinking psu. I did have the same fault a year ago and a replacement psu solved it.
 
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Unfortunately, all my PSUs are too old to have the same 24 pin connector my motherboard uses (they have the older 20 pin ones) so I can't try it on a different PSU.

I'll try powering up and resetting a few times to see if that'll breathe life into it.
 
Have you checked its connected to the right pins? I have to hold mine in for 3 seconds then let go.

I think I will RMA my Corsair HX620 in favor of the Enermax Infiniti 650W. Both are modular, but the Enermax is a bit more expensive.

Let me know how you get on. Please bear in mind it might not be the PSU, I dont want to start any anti Corsair riots on the forums.
 
Fans spinning no post, for me.. was the back plate on my Thermalright XP90 was shorting against the back of the mobo. If your HSF has a backplate - remove and reseat.
 
It's not shorting I tried it completely removed from the case, on a cardboard underlay to ensure no shorting.
 
I mean the HSF, the backplate on the HSF was touching raised solder points on the mobo, where there should have been insulation on the backplate of the HSF. I had to place nonconductive material between the back plate of the HSF and the mobo.
 
Mr Jack said:
Unfortunately, all my PSUs are too old to have the same 24 pin connector my motherboard uses (they have the older 20 pin ones) so I can't try it on a different PSU.

I'll try powering up and resetting a few times to see if that'll breathe life into it.
Click to expand...

That dont matter...If you have a psu with only 20 pins try powering the system up with that...It will atleast make the system POST...Obviously dont use it as a permanent power supply =P Just try it for testing purposes.

If you definitely have a case speaker connected properly, assuming its plugged in the rite way round (Or theres one on your mobo already?) If you was to try turning the system on without RAM installed you should get 3 long beeps.

As you dont, I would show that as a CPU fault, possibly motherboard...Take the cpu out of the socket, thoroughly check the pins on the cpu socket, make sure none are slightly bent, as this can cause the system to not post, we've had it at work a number of times.
 
artaxerxes said:
I mean the HSF, the backplate on the HSF was touching raised solder points on the mobo, where there should have been insulation on the backplate of the HSF. I had to place nonconductive material between the back plate of the HSF and the mobo.
Click to expand...

Ah, sorry. Nope, removed the HSF, and fitted the stock HSF instead. Still no joy.

I can't get a 20 pin PSU to fit into the power slot?

I tried connecting it to a "known good" speaker in a different machine - still no beep. And I tried reversing the connector, in case I'd got it the wrong way round.
 
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