ASUS P6T Deluxe V2 won't POST any more :(

FlakMagnet

FlakMagnet

FlakMagnet

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11 Dec 2006
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179
I build my PC about 18 months ago and things have run great since then. But recently, it sometimes won't POST when I attempt to turn it on. Sometimes it boots first attempt, and other times it takes several attempts before it fires up.

But today, it just wont POST at all :( I have tried to boot at least 20-30 times with no luck :( even disconnecting the power completely in between attempts - nothing is working.

I don't even get a beep code to tell me that something is wrong. Everything powers up, but no POST. I even took out the graphics card, sound card and RAM and disconnected all the drives, and nothing changes - when I try to start the machine, everything powers up, but nothing happens. I don't even get beeps when all components are removed.

Any help would be very appreciated, but do you think my motherboard has died? How do I rule out anything else?
 
Sounds like a mobo or psu failure. Gradual deterioration like that is a sign of the capacitors dying.
 
Is there any way I could determine if it's the power supply? Everything lights up on the mobo, the fans spin etc. and the hard drives all power on. Could it be that only part of the PSU has died?

Recently, when I finally get the PC to boot, it runs great until I turn it off again.

I do have another PC, but I'm not sure if the PSU is compatible.

The PSU is my dying PC is a "be quiet dark power pro 850W", and the PSU in my good PC is a Galaxy (something or other) 1000W, so it might be compatible.

I think I'll try swapping PSUs first, but if that doesn't work you think it's the mobo?

This could be an expensive process of elimination :(

Many thanks for your help.
 
If it's the Enermax galaxy it will work fine.

If it doesn't fire up then, then yes, I would certainly suspect the motherboard, particulary as you have no beep codes whatsoever.

Before you do all this, remove the CMOS battery for 5 mins (along with the PSU cable). Try starting up again once the CMOS battery is replaced and obviously ac power cable, but tbh this may only be a temp measure even if it works at all.
 
Was just trying removing the battery and clearing the CMOS. Left for 15 mins with everything out of the case. Guess what? When I put it back together, it all worked first time!

I restored my CMOS profile to the previous stable settings and it's working like a charm.

You say this is a temp measure, but what do you suspect the issue is now it's working again? Do you suspect the mobo?

Just so glad it's up and running again, but it sounds like I shouldn't get my hopes up too much judging by what you said?

Anyway, many thanks again - you hit the nail on the head!
 
You're in the same situation as you were before. Could be either psu or mobo (hence why I said temporary measure!). Try the enermax psu for a while and see if that solves the issue. Thats what I would try before splashing out on new hardware only to find you've replaced the wrong component.
 
Cheers w3bbo. I'll give that a go tonight. But I'm thinking it's probably a motherboard issue as clearing the CMOS got it working again with the same PSU.

I'll have a fiddle and post back on any progress. Shame that MoH arrived today and I can't even play it :(

<edit>Is there any way I can send you an e-pint for your help?</edit>
 
Mind if i ask FlakMagnet, did you first start experiencing cold boots upon switching the system on, had this with my own p6t dlx v2, upon first turning the rig on i was occasionally met with a black screen, all fans spinning etc, had to hit reset to boot into windows. Havent experienced this in a while now though, but your situation has got me a bit worried that my board is going the same way.
 
i have the same Motherboard and its just doing the same for me, yours must be round about the same time as mine 15- 17 months. i went through the whole elimination process with my friends computer and everything else is fine except the MB, the guys at work think it not discharging properly. i am tring to get it RMA'ed but so far ASUS have not responded to my emails and im beginning to get rather impatient, its been 3 days now.

its good to know that i am not the only one with this issue. not great that it has happened as i need my computer at the moment.

Paul
 
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Ive had mine since august last year, the boot issue never happened at stock, only when overclocked, i havent experienced any cold boots in a few weeks though, only thing i did change was to up my ram voltage from 1.64-1.66.
 
setter said:
Mind if i ask FlakMagnet, did you first start experiencing cold boots upon switching the system on, had this with my own p6t dlx v2, upon first turning the rig on i was occasionally met with a black screen, all fans spinning etc, had to hit reset to boot into windows. Havent experienced this in a while now though, but your situation has got me a bit worried that my board is going the same way.
Click to expand...

I am getting that (or at least the same symptoms where the machine doesn't start), but neither the reset button on the case of the one on the motherboard do anything in my case. I have to press and hold the power button to turn it off.

I have read of others having similar issues with brand new boards, so maybe something in the design is marginal, and now mine getting worn out :(

I've noticed that the blue LED under the first and second RAM slot does not light when the machine is not going to boot, and it does when it works. This got me thinking about RAM voltage etc. Will have to play about with that at the weekend.

I didn't get to mess with the machine last night as was busy. But hopefully I'll be able to investigate more either this evening or Saturday.

Snapples24 said:
Sounds like your MoBo is dying. Bit of a bugger, but its a great excuse to upgrade!
Click to expand...

True :) Although when it's working, it runs everything I throw at it, so an upgrade wouldn't really make much of a difference. Always a good excuse to give to the wife though if I do decide to upgrade later :)

PaulW said:
i have the same Motherboard and its just doing the same for me, yours must be round about the same time as mine 15- 17 months. i went through the whole elimination process with my friends computer and everything else is fine except the MB, the guys at work think it not discharging properly. i am tring to get it RMA'ed but so far ASUS have not responded to my emails and im beginning to get rather impatient, its been 3 days now.

its good to know that i am not the only one with this issue. not great that it has happened as i need my computer at the moment.
Click to expand...

Sorry to hear that :( Hope you get something out of ASUS though. Please let how know how this goes. Maybe it's something I could consider if you get a positive result :D


setter said:
Ive had mine since august last year, the boot issue never happened at stock, only when overclocked, i havent experienced any cold boots in a few weeks though, only thing i did change was to up my ram voltage from 1.64-1.66.
Click to expand...

I'd like to play with my RAM voltage to see if that helps. Only trouble is that when it doesn't boot, I can't even get into the BIOS to change it.

I have several things to try now, so am feeling a bit more confident I can narrow down the issue. I see OC don't sell these motherboards any more, so I'll have to find one somewhere else if I need one and ASUS won't RMA it.

Thanks to all for the help and info :)
 
OK, I've just checked what voltage I was running my RAM at and I've had it set to 1.2V!! The RAM is rated at 1.66V so I've upped it to 1.66.

I'm really surprised it worked at all at 1.2V! As I said before, once the machine booted it was rock solid.

Could this describe the issue I've been having? I'm guessing 1.2V wasn't enough to drive the RAM any more.

Wow! How embarrassing... :D

Fingers crossed that this has fixed it.
 
I seem to remember that these boards default to 1.2V. Not 100% sure. Maybe I'm thinking of my old A7V333.

What am embarrassment though :D @moderators : please remove this post through fear of being a laughing stock ;)
 
w3bbo said:
Have you tried the latest BIOS?
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Not yet. I'm currently about 3 updates behind, but the release notes on the later BIOSes don't seem to offer me much. Just updates for new CPUs, MS keyboards etc. The last update includes some 'stability improvements', but I've never had any stability problems until this not booting problem, so reluctant to update.

After changing RAM voltage, it's behaving properly again. Just tried it again this morning and booted first time :) So I'll probably stick with my current BIOS unless there is a good reason to change?

Quick question. Would I have to completely reset the CMOS if I upgraded the BIOS? I'm guessing I would, which is one reason why I'm a bit reluctant :D
 
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Just load the optimised defaults. The only option I would change to flash the bios is the memory voltage as you don't want the pc to reset as it's flashing the bios.
 
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