General discussion

PC unexpected shutdown then shutdown in BIOS

I'm having problem with unexpected shutdown after replacing my PSU ,graphic card and OS hard drive.

PSU: (Previous) Gigabyte 750W; (New) CoolerMaster 1000w
Graphic Card: (Previous) ATI Radeon 5850; (New) Geforce GTX 670
Hard Disk: (Previous) 1 TB Hitachi; (New) WB Veloci Rator 500GB

On Day1 and Day2 PC run with no issues. I was able to reinstalled windows 7 and all my software.

On Day3 after about 5-6 hours, my PC just shutdown with no warning. Then, when I tried to turn it on, it shutdown after displaying motherboard and CPU info but right before it shows the usual list of all detected drives.
Things that I did:
1. Replugged everything (PSU cable, Power cable, hard disks, Graphic Card but nothing.
2. Disconnected all my drives and tried to power on.
3. Testing RAM Card one by one
4. Reinstalling all my old hardware (graphic card, Power Supply) without hard disk connected.
All failed with a shutdown right before drives detection.
(CPU heat-sink is not hot at all and I never overclocked my hardware as a rule.)

Then I was away for about 20 minutes, when I came back and tried to boot, it was able to go past the drives detection but since no hard disk was connected, it shows the "Disk Boot Failure" Message.
Afterward, I switched back to the new Hardware Set, PC shutdown as before, then switched back to previous Hardware Set but still shutdown.

Eventually, I swapped to the new Hardware Set and replugged all my Hard Drives and decided to wait for the following day to try to turn it on. AND IT DID.
Run for about 6 hours without Issues (was able to run a game, download a couple of updates, play a movie) before it shutdown on me again. Same shutdown before drive detection problem.

Can anyone tell me what type on problem this is please, do I need to change CPU or motherboard ...?

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The story tells me

That it could be something such as a new PC builder that isn't checking that the heat sinks have fresh compound or are in full contact with the device it's cooling.

The CPU heat sink not being hot is a big clue here.

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Applied heat sink compound without success.

Thank you for the reply but I have just applied some heat sink compound without success.

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Remember I can't see your machine.

But the story so far reads like the usual Northbridge heatsink issue. Those other heatsinks matter too. And in those other chips on the mainboard as they heat up can cause not only shutdowns but the no drive detected as well.

Be sure that the BIOS is reset so there is no overclocking, etc.

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Might not be a heat issue

I tried resetting the BIOS and removing the CMOS battery.

Moreover, I do not think, it is a heat issue, because I tried to boot after a cool down of about 10 hours, same problem will occur. Replugged everything, from processor to power cable, it will keep shutting down on Posting BIOS. After about 15-20 attempts, it just boot to Windows. Then It shut down again after 3 hours of use.

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". After about 15-20 attempts, it just boot to Windows." is

". After about 15-20 attempts, it just boot to Windows. " is the classic symptom for BAD CAPS. Google BAD CAPS to get pictures of what to look for.

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Problem was with motherboard

Just bought a new motherboard and PC is running flawlessly. I checked for the BAD CAPS on my old one but there does not seem to have any. Plus my board use solid capacitors and from what I understand, those solid caps were used to cater for BAD CAPS.

Anyway, everything working fine now.

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Good to read.

But electrolytic caps do suffer from other issued than the ones you read about in the news. They can age faster in hot machines and last just a year or two. Solid or not, these parts are at best a 5 year life span. A better designer would over size the parts to extend the life span but today it's rare to find that since the competition is all about price.

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