To add a little to this, printers, particularly laser printers, create a sudden power surge. Try to place them on a different circuit if possible, had if they are in the same room. Or at least not onto the same UPS or surge protector. It is not common, but large appliances like old refrigeration compressors, air compressors or even washing machines can cause a surge.
In my area, we have a 50 year old or older underground power lines, and we get many momentary outages or surges each year. My electronics, UPS and surge protectors, and appliances are starting to be affected. The power company is aware of it and supposedly has plans for new lines. I live in the second or third larges city in my state.
Sent from my iPad,
Brent
toggle quoted message
Show quoted text
On Oct 25, 2019, at 12:32 PM, Daniel Settles <denver1.dan1@...> wrote:
Howdy
I'll second Randy's observations.
I've dealt with all three conditions at clients.
Denver Dan
On Thu, 24 Oct 2019 20:40:51 -0700, Randy B. Singer wrote:
The machine is from 2008, but it does all I need it to do. However,
I fear that the fans are not what they used to be and probably need
replacing. If I use it for any length of time it resets. If I leave
it with the log on page after it resets, in a few hours it resets
again. it makes a horrible noise when booting. I think it is the fan
but I am open to suggestions.
In my experience Macs tend to spontaneously re-boot for one of three
reasons.
1) There is too much current draw on the electrical circuit your Mac
is attached to. For example, a refrigerator cycling on, or a laser
printer starting up, will cause a huge draw. It might be enough to
cause your Mac to have a hard crash and then re-boot.
2) Your Mac is overheating. With old Macs this might be due to the
accumulation of dust inside the case insulating the heat coming from
the motherboard. Or detritus in the case might be strangling your
fans. Or your fans may be failing. If it is one of the first two,
opening up your Mac and cleaning it out may be all that is necessary
to fix things.
3) A failing power supply (flyback) or simply cold solder joints
around your power supply. Often the heat cycling in your Mac expands
and contracts the solder joints and causes them to eventually crack
(you can feel these cracks with your fingernail - but don't try this
without discharging your power supply first!) and causes a
discontinuity. Touching the solder joints for the power supply with
the tip of a soldering pen to re-flow the solder easily fixes cold
solder joints.
___________________________________________
Randy B. Singer
[|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|][|]
iSent from iDan's GyazMail on my MacPro
Brent