Computer doesn't always post.

Buchanan0204 said:
Fair enough. However, it will POST... just not all the time. Which indicates a failing PSU.

I see the same thing at least twice a week, every week. It wont turn on, fans spin up but nothing on monitor. You take the plug out, leave it for 5 mins. Come back and it works, when it's on it's fine. Same thing the next day. It's a sign of a failing PSU.
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Not always. Suggesting it could be the PSU isn't a bad thing, but straight up telling the OP it is without any real diagnosis/testing done is a bit misleading, is it not?

Same happened to me a long time ago back on my first few systems, was told PSU straight off the bat, turned out to be toasty VRMs on the graphics card and I'd just wasted another £40 I could throw at a new one :p

Another time was a bad northbridge on my motherboard which corrupted PCI data.

Just my two cents.
 
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armed_gorilla said:
I may get shot down in flames for this but you dont say what h/drive your running. Its not an OCZ SSD is it? I've had some similar problems recently, since i've removed the drive i've had 0 problems at all. I had the same with it turning on but not booting, no post beep etc.
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Oddly enough I was just about to ask the same. I have a WD2500JS that can be slightly temperamental, and the comp won't POST until it's finally spun up :o
 
I tried swapping out a known working PSU. No difference whatsoever; exact same behaviour of sometimes posting straight away as normal, sometimes having to restart about 20 times before it will post (then perfect function until next shutdown/suspended).

All I can think to try now is to flash the BIOS afresh, probably to the previous BIOS version; although it did happen once or twice previously (over the course of several months) it was only when i flashed the BIOS that it became very bad. :/
 
deltaluca said:
I tried swapping out a known working PSU. No difference whatsoever; exact same behaviour of sometimes posting straight away as normal, sometimes having to restart about 20 times before it will post (then perfect function until next shutdown/suspended).

All I can think to try now is to flash the BIOS afresh, probably to the previous BIOS version; although it did happen once or twice previously (over the course of several months) it was only when i flashed the BIOS that it became very bad. :/
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Buchanan, told ya so lol.

I assume you've tried swapping RAM sticks around etc? A BIOS flash is an idea, though I'd be a bit wary if it keeps resetting.
 
Okay... it seems like my issue has been solved now; but i'm not quite sure 'why'.

For the past 2 years (since building the computer) i've had the voltage on my RAM increased to match the RAM specifications and i've 'never' had any stability problems. Even once this isssue started happening, as soon as the bios posted, there was 'never' any stability issue or anything.

And yet after regressing my BIOS to a previous version and still getting the same issue I noticed that when the CMOS values were defaulted after flashing the BIOS that the system was posting normally, and that as soon as i put back the same overclock settings which have always been stable, the issues began.

I havn't tried going back to the BIOS version I had previous to the issue occuring to test if the overclock settings which have always been stable were unstable with that bios version too, but it seems strange to me that just upgrading the BIOS can cause these issues as a result of overclocking RAM?

And surely any stability issue with overclocking RAM would manifest itself all the time? not just in making the ability for the BIOS to post unreliable?
 
You might say not debugging with CMOS defaults was a bit silly :P but it never occurred to me that it could be the issue given that it's been perfectly stable for 2 years :X
 
Run on stock for a bit. I had this issue for a while, changing a setting or two made my comp work, but it died again a few days later, have seen the problem on a few Asus boards with 7xx chipsets. Maybe elsewhere too, not really sure what the issue was, just returned the board.

As regards to the CMOS reset, it's always the simple things ;) just see if it runs stably. Could be that your RAM can't take the extra volts anymore.

does it act like that?

Hopefully though, it stays how it is. :)
 
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no, quite literally the 'only' thing wrong was that it would not post reliably, as soon as it did post it would be completely 100% perfect until i next tried to turn it on
 
Having a similar problem with my PC (in sig) for the last 6 months. Sometimes boots up, other times just powers on with fans, but no display. Usually on a cold boot, then the second time it works. This is overclocked and not, makes no difference.

I'm going to try a new PSU today, otherwise I've got every other component to try as well, so it's narrowing-down time!
 
alex24 said:
Having a similar problem with my PC (in sig) for the last 6 months. Sometimes boots up, other times just powers on with fans, but no display. Usually on a cold boot, then the second time it works. This is overclocked and not, makes no difference.

I'm going to try a new PSU today, otherwise I've got every other component to try as well, so it's narrowing-down time!
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Is ACC enabled by default anywhere? if so, try disabling.
 
No, I don't think it's ever enabled by default, I've tried with it off and on etc, but doesn't seem to make much difference to be honest. The PSU wasn't my number one suspect, but it does sound plausible. It's a decent model, but it is about 3 years old now, and it's already been RMA'd once! If it has gone wrong, I might finally have to say Corsair PSUs maybe aren't all that since I've already had 3 RMAs to them, which aren't good stats to be honest. No, they weren't on all the same machine (or even house).

Anyhoo, I'll have to take the rig apart and have a fiddle. I will report my findings for the benefit of perhaps the OP, since we seem to have a similar problem. At least on the face of it.
 
Well, I rebuilt my rig into a different case and used a new PSU (Corsair HX650W) and it's good so far. I'll keep an eye on it and see if the problem comes back.
 
Wouldn't boot cold this morning as usual. So it's not the PSU. The other reasonable suspects are GPU, RAM and MOBO. I can swap all of those out, so I'm going to try.
 
thedude23 said:
Did you by any chance get to read my thread?let me know if your problem is similiar to my :)
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I did when you first posted it. My problem is not powering up intermittently, yours appears to include randomly shutting down, which seems more serious and may well be something different. If I were you, I'd try a different PSU before you do much else. See if you can borrow one somehow.
 
alex24 said:
I did when you first posted it. My problem is not powering up intermittently, yours appears to include randomly shutting down, which seems more serious and may well be something different. If I were you, I'd try a different PSU before you do much else. See if you can borrow one somehow.
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I will indeed ;)
 
Update on my issues. A new GPU doesn't seem to cause the failed boots, but I'm currently still monitoring it. Hope that helps someone.
 
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