[SOLVED] Green light is on but PC doesn't boot ?

[sandeept07]

Hello,

I have purchased a brand new PC (only cabinet part) in September 2020.
Configuration is as follows,

Intel core i3 9th gen 3.6 Ghz
Gigabyte H310 Motherboard
WD 1TB Sata
Kingston 8gb ddr4 ram
Nvidia 2gb GT710 Inno3d
Artis Cabinet and smps

It's having a weird problem.
When I start it, green light in cabinet front part turns on but red light is off. Monitor is blank. No sounds, no beeps. SMPS fan spins. I am not sure about CPU fan but mostly it spins too.

I press power button for 5 seconds. It shuts down. I wait for 5 seconds and start it again. It boots normally.

Once booted, no issues. It works absolutely fine.
The painful part is, there is no consistency in this issue. Sometimes, I don't get it in a month and sometimes thrice in a week.

Google search gave me few suggestions

1. Clean RAM - It's a brand new PC. So, I don't know if cleaning RAM would help. Unless someone confirms, RAM could be defective.

2. Check power supply - My PC runs on UPS (Uninerrupted Power Supply). Its battery is old. But, my old PC run on it without any issues. Even now, this PC and my monitor are plugged into it. No problems seen ever.

3. Operating system (Windows 10) corrupt - I don't see BIOS screen. So, I don't think, OS is into picture. However, one observation. When I start PC afer seeing this issue, it takes time to boot. Mostly, I see "Please Wait" message with the famous Windows spin animation. Once booted completely, no issues. Runs at normal speed.

I am not a hardware expert. So, I don't want to create bigger issues by plugging in-out any parts/cables.

Thanks in Advance.

Thanks,
Sandeep

 

[rgd1101]

brand and model of the psu?

 

[sandeept07]

Hi rgd101,

Please see

https://prnt.sc/10l9ctx

Thanks,
Sandeep

 

[rgd1101]

replace the psu with a quality psu

 

[sandeept07]

Which one would that be?
Are you sure, new PSU would fix this?

Thanks,
Sandeep

 

[geofelt]

One is never sure that the psu is the cause of issues.
The only way to be certain is to replace with a known good unit.
I think I would do so, regardless.

Power supplies included with cases are almost always cheap units.
Antec is, I think, about the only one with decent units.

A cheap PSU will be made of substandard components. It will not have safety and overload protections.
The danger is if it fails under load, it can destroy anything it is connected to.
It will deliver advertised power only at room temperatures, not at higher temperatures found when installed in a case.
The wattage will be delivered on the 3 and 5v rails, not on the 12v rails where modern parts
like the CPU and Graphics cards need it. What power is delivered may fluctuate and cause instability
issues that are hard to diagnose.
The fan will need to spin up higher to cool it, making it noisy.
A cheap PSU can become very expensive.

Do not use one.

 

[sandeept07]

Hi geofelt,

Thanks for the detailed response.
I'll do that.

But, as said before, there is no consistency in this problem and PC works absolutely fine otherwise.
So, I had a doubt in mind if PSU change would fix this.

Thanks,
Sandeep

 

[InvalidError]

Every time I have had inconsistent power-on behavior in a PC among friends and family in a computer that "works perfectly fine otherwise", it was dying output caps. The first thing that usually dies is the 5VSB rail's capacitors (problems shutting down, unable to resume from standby, peripherals disappearing after waking up from standby, etc.), followed some time later by the primary side's auxiliary supply capacitors that feed the primary converter. After a while, the PSU won't power up anymore because the auxiliary rail caps can't hold enough charge to keep the main converter above its under-voltage lock-out.

 

[geofelt]

I have no guarantee that the psu is actually your problem.
But, strange, inconsistent behavior is one of the indications of a failing psu.
Test with a known good unit to see if that is actually the issue.
Borrow one if you can or buy from a shop with a good return policy if you must.
A 15% return fee is fair.
Buy only a good one.
Here is one list of estimated psu quality:

PSU Tier List [OLD]

Credit to @Starelementpokeand @Energycore for helping out with this long-awaited refresh of the old PSU tier list by Aniallation (who previously went several months without logging in), leaving the old list in need of help. This is simply an update of the list that was flawed in creation by the P...

linustechtips.com

Look for tier 1/2, no less than 3.

 

[sandeept07]

Thank you everyone for your valuable inputs

Thanks,
Sandeep

 

[sandeept07]

Before I close this topic, one final question.

My PC is connected to iBall UPS (which is a good brand in India). I haven't changed its battery for more than 2 years.
Can it be the culprit instead of PSU?

Note : My old PC was running fine with it. However, it also didn't have a standard PSU.

Thanks,
Sandeep

 

[InvalidError]

A dead battery would cause the UPS to shut off whenever it would normally kick in for whatever reason.

I replaced my PC's CyberPower UPS a couple of months ago because its battery voltage monitoring quit working (always reading 24V) which caused charging to stay on all of the time and fry three cells by the time I realized what was going on.