My computer has died

May 4, 2020 at 11:08:31
Specs: Windows 10, 4GB
I have a custom built PC that died on me a few days ago. The symptom was the screen just suddenly died while I was working with no warning. The computer then automatically went to restart and that's where it ends. No video at all and it just will not proceed any further. I have taken the graphics card out and placed it in another slot. No joy. Fan on graphics card does not turn either. Motherboard is ok (I think) as all other components work however can't see to confirm my 3 drives are ok. On the front top of my Unicorn cabinet near the red power button is now a flashing blue light. This I think is to tell you there is a problem. With all hard drives disconnected the blue the blue light is still flashing. Is there such a thing as a reset button on the motherboard or am I missing something. Driving me mad. Help much appreciated.

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#1
May 4, 2020 at 11:55:21
The first thing to try to diagnose the problem is find the user
manual for the motherboard and maybe also for the cabinet
and see if they say anything helpful, particularly about the
flashing blue light. Mine had a section on troubleshooting.

However, it sounds like the most likely problem is the power
supply unit (PSU). Replace that and you'll likely be good to go.

Anything a reset button can do, powering off and back on again
will do.

A flashing blue light on the power button is normal on many
computers to indicate sleep mode. But you say the power
button is red, and the flashing blue light is not normal, so I
dunno.

-- Jeff, in Minneapolis


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#2
May 4, 2020 at 12:45:37
I have diagram for motherboard. No manual.
Not much for cabinet but leaflet says flashing blue lights means there could be a drive problem. I said that I have disconnected all drives and still it flashes. Power supply is ok as everything else powers up. I must say that the power lead to the graphics card is just one of five leads going to graphics card only. Not sure how to check that.

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#3
May 4, 2020 at 13:10:45
"Power supply is ok as everything else powers up"

Not necessarily. Fans & lights used very little power. The CPU & graphics card are the main power hogs. Your PSU might be putting out enough juice for the fans & LEDs, but not enough for the CPU & graphics. Please post the make/model/model numbers for both the PSU & motherboard.

BTW, the board's manual can be downloaded from the motherboard manufacturer's website.


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Related Solutions

#4
May 4, 2020 at 20:01:36
The fact that it went out suddenly and stays out suggests
that some component failed catastrophically. I didn't have
to use that word, but I like it, so I did. The component is
most likely either on the motherboard or in the power supply.
It is cheaper and easier to replace a power supply than to
replace a motherboard, and it really does sound to me like
the problem is in the power supply. In "normal" conditions,
most computer repair places can test power supplies. With
almost everything closed down, it might be quicker to buy
a new PSU than have it tested.

You can closely examine each component on the motherboard
to see if anything looks burned. Capacitors sometimes bulge
when (or before) they fail. If you can see into your PSU, you
could try to eyeball that, too, though it is likely that you won't
be able to see enough to determine anything.

Do this only after unplugging the computer and then pressing
the power button for ten seconds or longer. And do what you
need to to avoid electrostatic discharge. Not always a problem,
but the tinier they make those components, the easier it is to
zap them.

-- Jeff, in Minneapolis

message edited by Jeff Root


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#5
May 5, 2020 at 00:40:52
Thanks for all valuable information.
Just had a quick loom at power supply fan and that is spinning as normal and power seems to be going to motherboard. However I will check voltages with my meter. On the back of my Corsair power supply it tells me the voltage settings are they AC or DC?
Some are 3.3 some are 5 but I have a few that say V1 & V2 what are they?
Also I have 4 black terminals and 2 red can any body explain. My graphics card only was plugged into a red socket 🤔🤔🤔

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#6
May 5, 2020 at 03:19:26
Try to measure the voltages from the connector top while still connected to the motherboard.
layout of an ATX 24 pin: https://www.lifewire.com/atx-24-pin...

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