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ryanbatcund

Pc won't POST

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Hey guys - my son was playing around behind my pc earlier today (he's 2, wears fleece PJ's) and my wife told me it won't turn on now, it just power cycled and the fan turns on then off, it's like a repeating cycle.

 

I havent been home yet - maybe resetting CMOS would help?

 

Any ideas?

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Should not be a CMOS thing if you have had it powered on for considerable periods.

 

Call her and tell her to disconnect everything, bar the keyboard and the mouse, and see if it makes a POST beep. If it does not, then it needs looking into.

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Hopefully his fleecy jammies didn't generate a static shock which zapped it into oblivion. GPU issues have driven my PC into a state where it wouldn't POST. Possibly he knocked the HDMI cable loose so it's shorted or N/C'd a couple of pins or (less likely) your GPU itself? Fully power down (power supply switch), make sure your monitor cable is well seated, then power up... fingers crossed?

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Very good line of thinking there, odourboy. Did not think of that fleece connection. Hope it all ends well.

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"Darn honey, I need to buy new pc parts"

 

Lol

 

Still at work I'll try it when I get home

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"Darn honey, I need to buy new pc parts"

 

Lol

 

Still at work I'll try it when I get home

Can you not call her to try and establish if it is a odourboy  suggested, a GPU blow-out? That way you'd be forearmed because if you do get home, and it is a GPU blow-out, you'd still be in the no POST situation your wife currently is in.

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I tried removing the GPU still won't POST

 

Tried clearing CMOS no difference

 

There's no mobo speaker so I don't hear any beeps

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Ryan, you have my sympathies. I took my son into my computer performance lab when he was young, and he just touched one of the serves. Took me 30 minutes to get it back to life...

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I remember your issues with static electricity last winter. I'm afraid your system may have received one "zap" too many. The kind of damage that high static electricity can produce in computer hardware tends to be cumulative...

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If this was your pc what would you guys do?

 

A friend is coming over today he's bringing RAM and other stuff ... We'll see if we can get her going.

One thing to note - when I pull all the RAM out the powered stayed on for about 15 sec as opposed to 3.

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Hi,

 

I had this problem many years ago, when the reboot happened it was in the process of testimg ram memory... Turned out I had a bad stick, if you have more than one stick of ram try one stick at a time, you may be able to find the bad one if that's the problem.

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It sounds like you've got a plan Ryan. The 'engineering' approach is to divide and conquer - isolating components until you find the faulty one. Is your friend bringing a PC power supply?  In theory, with just a working mobo, a VGA monitor and a power supply, you should be able to at least see some action. I've never been confronted with a totally dead PC, so I afraid I can't offer much else.

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I just have a hard time imagining that your son could have caused a detrimental static discharge from outside of the computer case. I saw that you live in MN and considering that you likely have the heat on constantly (which dries the air considerably), combined with fleece PJs, would make for a great opportunity to generate some static electricity. However, the case itself should be grounded. If he bumped and shorted the PSU--which, in my mind, is one of the few critical components that has an external exposure to the "outside world"--the computer shouldn't even be able to turn on... at all.

 

All of this aside, typically a computer won't POST because, unfortunately, one or more of the three most important components (CPU, RAM, and MoBo) aren't working. Having a buddy bring over some RAM (hopefully that he's tested and is working) is a great start. Getting a hold of a "spare" CPU or motherboard may not be as easy but the RAM is a great start...

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Yeah we're gonna go over it with a fine tooth comb. He's done way more builds than me - more expertise than me too.

 

I'll let everyone know what we find.

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Ryan, I glanced at your specs and wondered if your Gigabyte motherboard has a debug LED? If you load it up with the case open you will see a little code displayed on the board as each initialization step happens, so you can see how far it gets or what error code gets thrown out.

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Well it's the RAM.  The RAM however, is not bad.  It's just that I'm using two different revisions.  Four years ago I purchased 2x4GB of Corsair Vengeance.  A few weeks ago I decided I wanted 16GB total (XP10 x64 usage) - so I found my order history in newegg and bought the same stuff in 2x4 GB variety.  It may have been a coincidence or not, but while all four stick were working in harmony, yesterday they decided to quit.  

 

Booting with original sticks in slots 1 and 3 worked...  New sticks in 1 and 3 worked.  Each stick worked fine separately as 4GB.  But when I attempt to boot with all four (old ones slots 1 and 3, new 2 and 4) it won't POST.

 

Turns out the new sticks are a different revision (identical part number though)....  and my mobo doesn't like the differences....  hmmmm

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Check the voltages 1+3 sticks are dialled in for versus sticks 2 and 4.

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I can't even POST with all four... how would I set the voltage for four with only two?

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here how to go about his

most fundamental test to do is to

remove all memory slots and power the PC on

at this point cross your fingers and hope for a beep sound

don't expect anything else other then a warning beeping sound

if you didn't get the warning beep; your board is fried

if you got it; then you can move on to the next test

 

restore your memory back in place

make sure all your peripheral equipment are disconnected (usb etc); pull all you pci slots out and re-seat them

make sure your pc is free of dust (use a new thin painters brush to clean tight places)

(do not connect peripheral equipment back in yet)

try to boot; still no go at this point?

 

from my experience, id go to the next thing i know 9 out of 10 is the cause

if when you turn on the pc; the power light comes on but nothing happens

its the power unit went bad; they don't go bad by not turning on

in many cases there's a low voltage enough to power the led's

in rare cases enough to get you through post;

but once you pass post and try to power up; everything turns black

switch your power unit; even if its just for  testing borrow from another PC and try it on your current (its plug and play; you cant go wrong)

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Not sure if you saw the post at the top of this page...it's the RAM is four slot configuration / different revisions causing the issue.

 

Also I don't hear beeps... there is no speaker on my mobo.  I also have no LCD on my board.

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I can't even POST with all four... how would I set the voltage for four with only two?

I'd a feeling you'd misunderstand what I was trying to say. What I meant was check, physically if it says on RAM sticks 1+3, e.g. 1.3V/1.5V, and if it says, e.g.1.8V on sticks 2+4. Sometimes some motherboards will only accept RAM sticks that are of a certain voltage rating and it is a good idea to have all four sticks at the same voltage rating, like I have in screenshotRAMvoltages.jpg

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Same Make of RAM as me, if not the same speed, so is a very reliable brand.

 

If it is still new, perhaps you can get Newegg to change it for you and then test the newer sticks.

 

One other thing, I'd do. As your mobo sounds like it is has a Dual Channel RAM controller, even though you stated that each stick in a memory slot worked fine, i.e showed up as 4Gb each. and sticks 1 & 3 worked fine in memory slots 1+ 3 respectively, thus giving you one set of Dual Channel memory management, have you tried those newer sticks in slots 1+3 just to disprove that memory slots 2+4 are okay? If they do not  boot in that Dual Channel mode in slots 1+3, then you know that slots 2+4 are faulty. Has happened to me on an Asus board.

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Yeah I did try that - both sets in 1/3

And when you fit sticks 2 + 4 in memory slots 2 & 4 does it boot? If not, then it is the memory controller for that set of Dual Channel memory management that is kaput, cos you have just proved both sets of 2x4 +2x4 working in memory slots 1/3.

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