Ot: PC Not starting up (help)

VMP wrote on 9/14/2015, 1:18 PM

This really is a strange issue.

Suddenly our second PC doesn't respond to the start button (this already happened a week ago).
The Motherboard green led is on.

I have:
- Connected another power supply, still doesn't start.(The donor power supply did have another 4 pin 12v MOBO top left connection but that shouldn't be a problem)
- Checked If the button is broken (when pressed the Power supply gives another high pitched tone than when idle. Also manually connected the pins together with metal)
- Checked the little motherboard battery, have replaced it, still doesn't start, then put the original back on it.
- Started the pc without connecting anything on it.
- Removed the graphics card and tried it.
- Changed the power cord.

The most strange thing about it is when I brought it back to the pc dealer, it just started again!
So they could not find anything strange about it. But I knew that not finding any problem would make it return.

Now some days later... the same issue.

The only thing that could be different at the dealer is their power grid, I presume, So I went and tested the pc at the neighbors house but still the same.

The night before this occurred for the first time there was a lighting strike not too far away.
But all the other PC's are fine. So that may not be the issue.
I have build Pc's before so I am not a total noob.

What do you guys think?

Motherboard: P8H67-M LX
OS: Windows 7

PC hardware info:

CPU
Intel Core i5 2500 @ 3.30GHz 33 °C
Sandy Bridge 32nm Technology

RAM
4,00GB Dual-Channel DDR3 @ 665MHz (9-9-9-24)

Motherboard
ASUSTeK Computer INC. P8H67-M LX (LGA1155) 30 °C

Graphics
1024MB ATI Radeon HD 5400 Series (ATI AIB) 40 °C

Storage
OS:
238GB Samsung SSD 840 PRO Series ATA Device (SSD) 29 °C
931GB Western Digital WDC WD10EALX-009BA0 ATA Device (SATA) 33 °C

Edit:

1. Changed the power supply.

2. The 12V ATX on the corner of the MOBO is connected, the PC ran fine with the new PSU, it's the next day that it fails to power up again (until it stands for 24-48 hours without power, then it starts and runs, untill it fails to start the next day...the cycle goes on)

3. I have connected the PWR SWTCH pins manually to jump start it, the same, so its is not the power button either.

Like another member mentioned: Some of the capacitors of the motherboard might have been depleted.

The PC is now at the dealer.

I'll keep you updated.

VMP

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Comments

craftech wrote on 9/20/2015, 7:47 AM

If you click on the link in my last post for the user complaints, you will see that that MB is Out of Stock. On Google shopping I see a lot of them "refurbished". Not very promising. Get a different motherboard.

John

JJKizak wrote on 9/20/2015, 8:54 AM

This is kind of dumb but have you tried re-seating the CPU?
JJK

riredale wrote on 9/20/2015, 7:58 PM

Yup, R&R the CPU and look for bulging capacitors. Go on eBay to see how much a replacement motherboard and/or CPU would be. Looks like a heat-related intermittent, probably on the board.

My motherboard began acting flaky (swollen caps) several years ago, replaced it with an identical board off of eBay. Also bought a CPU on eBay that was the fastest one that would run on that board. Board about $50, CPU about $80. System runs great.

VMP wrote on 10/29/2015, 5:40 PM

Well guys to give you the latest update about the PC.

The Good news the PC is running well again, with a new motherboard and CPU.
The previous hardware enigma remains an enigma, I have checked the capacitors of the old motherboard up close, nothing seem to be bulged. I can post a photo if needed.

A long time has passed, the dealer chain where I brought the PC to had financial problems so they halted their work for a while, later they looked at the pc' and said that it is probably the motherboard, but can't order a replacement.

I then collected the PC and bought a new Motherboard: Asus H81M-Plus and a new CPU: Intel Core I5-4460.

I hated the idea that a clean Windows install had to be done and that the previous profile and settings would be lost.

But I found a great way to make the previous Windows 7 compatible with the new hardware.

In short: http://www.dowdandassociates.com/blog/content/howto-repair-windows-7-install-after-replacing-motherboard/

1. Boot up the pc check if it starts, ours doesn't go any further than the Windows Logo then restarts, due to the new hardware.

2. Boot up the PC with Windows 7 installation disc.

3. Choose repair.

It says it can't, normally one would give up and do a clean install.

But here comes the magic.

As stated in the article above, I put the disc with drivers for the motherboard into the drive (I just inserted the motherboard driver CD that came with the new motherboard) then typed in 'dism /image:c:\ /add-driver /Driver:e:\ /recurse . and voila!

Windows installed all the necessary drivers and Windows just started as usual. All working fine and well, went through the control panel and checked if all hardware were installed and did a windows update as well just to make sure.

Now that the PC runs and can be used, I have been thinking of building an another pc using the old motherboard, CPU and the power supply, just as an experimental PC. Maybe after some experimentation I can find it's problem.
Maybe do a bios flash or even replace the capacitors.

Those small cube pc casings looks nice, if it runs fine then I could use it as a server or Home Theater pc.