Mouse stopping PC from powering on.

[Rowan529]

Hi All,

We have an issue, where certain computers are affected by what seems to be faulty mouses...

Whenver we try to power the PCs on (Optiplex 790 SFF), the power light flickers orange for a split second, and goes straight off. The only way to get the PC to actually power on, is to remove the mouse...

The mouse will not work when plugged in, and neither will the keyboard (if mouse plugged in). There are no visible signs of damage on the mice, and both work fine when plugged into a different machine... The issue seems to be solved once the mouse has been replaced...

Any ideas on why a mouse can stop the PC from powering on?

 

[Neur0nauT]

I had similar issues like this with Optiplex in the past, particularly if there had been power outages. I would attempt to switch on a PC and the power LED would flash amber for a few seconds. The only way I worked around this was to disconnect the main power cable for a few minutes to discharge the mainboard completely. Then it would seem to switch on normally after reconnecting the power cable. Not sure if this will have the same affect for you.

It could be that the USB root hub is causing power issues for booting during a return from full power cut. Possibly a faulty PSU on the systems. Would this be the case for you?

 

[Rowan529]

I had similar issues like this with Optiplex in the past, particularly if there had been power outages. I would attempt to switch on a PC and the power LED would flash amber for a few seconds. The only way I worked around this was to disconnect the main power cable for a few minutes to discharge the mainboard completely. Then it would seem to switch on normally after reconnecting the power cable. Not sure if this will have the same affect for you.

It could be that the USB root hub is causing power issues for booting during a return from full power cut. Possibly a faulty PSU on the systems. Would this be the case for you?

Hi Neur0nauT,

You are correct, unplugging it from the mains does solve the issue, however only for a short period of time... The next morning the issue will be happening again...

The only real solution we've found is to swap the mouse, and then that seems to solve it. Im just bewildered as to how a certain mouse can stop the PC from booting...

It may be the PSU, as we have had a lot of issues with 790SFF PSUs, for the time however, swapping a mouse is more cost effective than swapping a PSU...

Many Thanks for your response.

 

[Neur0nauT]

I had similar issues like this with Optiplex in the past, particularly if there had been power outages. I would attempt to switch on a PC and the power LED would flash amber for a few seconds. The only way I worked around this was to disconnect the main power cable for a few minutes to discharge the mainboard completely. Then it would seem to switch on normally after reconnecting the power cable. Not sure if this will have the same affect for you.

It could be that the USB root hub is causing power issues for booting during a return from full power cut. Possibly a faulty PSU on the systems. Would this be the case for you?

Hi Neur0nauT,

You are correct, unplugging it from the mains does solve the issue, however only for a short period of time... The next morning the issue will be happening again...

The only real solution we've found is to swap the mouse, and then that seems to solve it. Im just bewildered as to how a certain mouse can stop the PC from booting...

It may be the PSU, as we have had a lot of issues with 790SFF PSUs, for the time however, swapping a mouse is more cost effective than swapping a PSU...

Many Thanks for your response.

You are welcome.

Yeah, it just reminded me of the issues I had with them previously, much the same issue as I had with them. The PSU's do not last well on Optiplex PCs. I suppose good enough considering they are usually on 24/7 in a business environment, but it is usually the first thing to go on them. More specifically after power surges or outages.......to be expected I suppose.