HP P6 desktop won't power on but has green light

[leeroy221]

Hi,

So, I have an HP Pavilion P6 desktop that won't power on. The green light on the PSU is solid so there is power going to the system and the power button is fine. 

I have tried the resets but this has made to difference. All internal cables have been checked and are fine.

Is there anything else I can try or any idea on what needs replacing.

Again, as I have a solid green light I assume the PSU is absolutely fine?

Thanks,

Lee

[ub6424]

Hello @leeroy221 

It would be wise to measure the current (V) applied to the motherboard with a multimeter.

Please report your results.

best regards

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[leeroy221]

Hi,

Unfortunately I don't have a multimeter. Do you have any other suggestions?

Thanks.

[ub6424]

Hello @leeroy221 

>All internal cables have been checked and are fine.

The one for switching the computer on, too ? PWR ON connector

best regards

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[leeroy221]

Hi,

Yes, just double checked, unplugged and plugged them back in and they are fine. 

[ub6424]

Hello @leeroy221 

Like I wrote before ...

=> It would be wise to measure the current (V) applied to the motherboard with a multimeter <=

If you can't do that, you're not going to get it running...

Please borrow another working power supply to check if there is a defect on the mainboard.

best regards

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[leeroy221]

Hi,

I have ordered a new PSU, should hopefully come tomorrow. I will let you know how it goes 🙂

[leeroy221]

So... I installed the new PSU and had the same fault, constant green power light but the desktop not powering on. Disconnected and tried again, still the same. Disconnected the new PSU and connected the old one back up, tried that again, still the same. Then thought about the motherboard battery, moved that around tried to power but nothing. Put the cover back on the desktop and was going to take to a repair shop. Before I left I thought I best try it one more time after putting the cover back on, low and behold, it powered on. Now though, I get a bios problem on startup so I need to replace the motherboard battery. I am going to make an assumption that the motherboard battery was the problem all the time? Although, as far as I am aware, it wouldn't normally effect the power, just the bios upon startup?

[ub6424]

Hello @leeroy221 

Yes, in this case the CMOS battery (CR2032) could be the problem, put in a new one ( has 3V Voltage ! )

Please report your results

best regards

---

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