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Windows 7: PC powers up but displays nothing

30 Dec 2017   #1
draptak

Windows 7 Ultimate 64-Bit
 
 
PC powers up but displays nothing

My PC is acting weird, was good now all of a sudden it lost power, sometimes it will turn on and display nothing, then I turn it off, and it won't back on for a few hours or the next day. What is wrong here? I had this motherboard for approx 8 years

I'm using a CX750M corsair PSU, I had this tested using the paperclip, it powers on with the fan running.

I tried a new CMOS battery to see if it solved the problem. No luck

I switched the Jumpers (CLRTC) back and forth vice versa, but no luck in that

I unplugged the RAM sticks and back, and I still used one RAM stick to see if it would turn on but no luck

I also tried to see if the Power button is the issue using the screw driver method on the two pin. but no luck.


Any solutions would be welcome, I'm thinking my motherboard might be dead? But the LED light is on


Specs:
PSU: CX750M corsair
CPU: Intel® Core™2 Quad Processor Q9400 at 2.66 GHz
GPU: GTX 770 2GB DirectCU II
Memory RAM: 6GB
Windows 7 64bit


My System SpecsSystem Spec
.
30 Dec 2017   #2
Megahertz07

Windows 7 HP 64
 
 

Does your MB has internal graphics to test without the GPU?
Have seen the same problem due to corrosion on the MB. Do you live by the sea?
My System SpecsSystem Spec
30 Dec 2017   #3
draptak

Windows 7 Ultimate 64-Bit
 
 

Surely its nothing to do with the GPU. I already tried my old GPU but same story I'm not getting any thing on my monitor. I know my monitor isn't the problem.

Quote   Quote: Originally Posted by Megahertz07 View Post
Does your MB has internal graphics to test without the GPU?
Have seen the same problem due to corrosion on the MB. Do you live by the sea?
My System SpecsSystem Spec
.

30 Dec 2017   #4
Megahertz07

Windows 7 HP 64
 
 

Have seen the same problem due to corrosion on the MB. Do you live by the sea?
My System SpecsSystem Spec
30 Dec 2017   #5
Bat 1

8.1 home x64
 
 

You have a decent PSU but even those can go bad. If you have a multimeter you could check the 12V output. More likely given the MOBO ago would be bad capacitors. Get a magnifying glass and carefully inspect the capacitors on the MOBO especially those closet the CPU socket.
My System SpecsSystem Spec
01 Jan 2018   #6
johnhoh

Win7 pro x64
 
 

I think that psu is fairly new, so you probably have a bad motherboard.
My System SpecsSystem Spec
03 Jan 2018   #7
TechnoMage2016

Windows 7 Ultimate, SP1, x86
 
 

With an 8 year old PC, that's never had any major upgrades, anything is possible.

That PC definitely dates back to the days when many manufacturers were using those cheap Chinese capacitors that would fail, bulge and leak after a few years of operation. Those Bad Caps wound up in PSU's as well as motherboards. Every failed PSU that I've looked into had bulging capacitors. And likewise the failed motherboards.

I'd have to use a PSU tester on that PSU to make sure that ALL of its output voltages are present and at the proper level. If just one of the lesser voltages, like the -5v, is missing, the motherboard won't boot up. Poking around with a VOM can work, but is fraught with problems.

There is one failure mode that has thrown many a user and inexperienced PC tech for a loop. It's an old and failed CMOS Battery that has caused a Lock-Up condition in the BIOS. In such a case it is necessary to remove all power from the system, then remove the old battery and then wait at lest a half hour before installing a NEW battery.

I've actually been given several PC's over the years that by all indications were totally DEAD. After performing the above procedure, the PC came back to life and worked perfectly. It's just not something that we see every day.

Good luck Mate,
TechnoMage
My System SpecsSystem Spec
04 Jan 2018   #8
mrjimphelps

Linux Mint 18.2 xfce 64-bit (VMWare host) / Windows 8.1 Pro 32-bit (VMWare guest)
 
 

Quote   Quote: Originally Posted by TechnoMage2016 View Post
Every failed PSU that I've looked into had bulging capacitors. And likewise the failed motherboards.
A benefit with this problem is that it is very easy to know that this is the problem just by looking at the capacitors. I saw a lot of failed motherboards with bulging capacitors back in the early 2000s. Pull the cover off, take a quick look, and you're done diagnosing the problem. And if I told Dell that that was the problem, they immediately sent me a replacement motherboard, no questions asked (if it was still under warranty).
My System SpecsSystem Spec
04 Jan 2018   #9
TechnoMage2016

Windows 7 Ultimate, SP1, x86
 
 

What really burns my grits, is the person who asks what to do, and then refuses to even pull the side panel off of their desktop PC, to just LOOK at their motherboard. Let alone opening up their PSU to see if there are bulging and leaking capacitors inside.

Those folks should just get off of the forums and take their PC to a reputable repair shop, for diagnosis and repair. (NOT the Geek Squad!)

Cheers mates!
My System SpecsSystem Spec
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 PC powers up but displays nothing




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