Question about 3Com SuperStack 3 3870 48-Port (3CR17451-91) Networking Switch

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Switch powers off

What would cause the switch to shut down? The switch is on a UPS, which is working. The switch will power on after unplugging and plugging back in

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  1. Faulty power supply
  2. Heat issue

See if there are any logs on the switch that you can check for errors. If you can't I suggest you call 3Com for troubleshooting.

Posted on Nov 05, 2013

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My D-Link 2750U router is not working from last evening due to the heavy rain, lightning and storm. What should I do?


If you have lost three devices I'm sure you had ALL your computer devices on a UPS/Surge protector? Always connect ALL computer devices to a Power strip, UPS, or even better, unplug or switch off when not in use. A power strip with Surge Protection will help, most have a power switch/ Circut Breaker, to shut down ALL devices connected when not in use.

Feb 14, 2013 | Computers & Internet

1 Answer

I hit the button to turn it on it will stay on for awhile and then it will start beeping really loudly an shut off


With your UPS turned off, unplug your PC and all other devices from the unit. Then turn the UPS on. If it still beeps and shuts off your UPS internal battery may need to be replaced or you have an internal UPS failure. Look for a red "battery alarm" light on the front of your UPS.

If the UPS does not shut down with all devices disconnected from it, Power off your monitor and look on the back of the monitor for a label which will tell you the amount of power it requires (probably 100 watts or less). Plug the monitor's AC power cord into your UPS and turn on your PC and monitor. With the UPS plugged into the AC line you are not using the internal battery and the UPS should remain on and your monitor should be working. If it shuts down you have an internal problem with the UPS.

Now unplug your UPS from the AC line (simulating a power failure) Your UPS is rated at 350 watts. Accordingly it should easily support the 100 watt load of your monitor. If the UPS continues to provide power to the monitor for 1 or 2 minutes down it's an indication that it's working properly and the COMBINED LOAD of your monitor. PC etc. when plugged into the UPS is exceeding the 350 watt capacity of the UPS. You will have to disconnect 1 or more devices from the UPS.

NOTE: Never plug a laser printer into an UPS.

If the UPS immeadiately shuts down after disconnecting it from the AC line with only the monitor plugged into it you have a bad battery.

If you found this information to be helpful to you please return to the FixYa website and rate me.

Regards,
Yavacotech

Dec 07, 2010 | APC Back-UPS ES 350 - UPS ( external ) -...

1 Answer

I have a Dell Dimension 5100, after a power outage yestarday, the computer doesnt want to turn on. there is a green light in the motherboard that stays green for as long as i have power conected to the...


The greenlight is probably the UPS [Uninterruptible Power Source]. If the computer was shut down by a normal windows shutdown and the UPS remained plugged into the 120 Volt line and the computer's power supply plugged into the UPS and the UPS NOT turned off, there would still be 5 volt standby voltage applied to the computer's motherboard. ATX type computers never go completely off unless the power supply is turned off or unplugged.
That 5 volts would have to on steadily for the rest of the voltages from the supply to turn on.
If there is a reset button or on off switch at the back where your power cord plugs in toggle it back and forth. You can also try disconnecting the power supply and holding the power button in for about 15 seconds to discharge power.Leave it unplugged for a few minutes. Then try powering it back up again. If those don't work then you might have a bad power supply. They are not hard to replace.
Hope it helps

Nov 20, 2010 | Computers & Internet

1 Answer

The ups shuts down the pc randomly


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May 03, 2010 | Mustek PowerMust 800 (POWERMUST800USB) UPS...

3 Answers

My 42HDS69 Hitachi has a recurring problem of not turning on. I unplug from outlet for awhile and sometimes it will turn after I plug in outlet, Other times it takes a few hours for TV to turn back on. ...


MY TV KEPT GETTING WORSE EACH DAY ALSO. BUY A CAN OF SPRAY AIR WITH THE EXTENSION SPRAY TUBE. WHEN YOU GET THE TV RUNNING SPRAY THROUGH THE HOLES IN THE BACK RIGHT ONTO THE FAN BLADES OF BOTH FANS. THE DUST WILL FLY OFF THE BLADES. A VACUMM HOSE WILL HELP PULL OUT THE DUST. ALSO SRAY THE POWER SUPPLY BOARD FOR DUST. I APPEARS THE FANS SLOW DOWN WITH DIRT ON THEM AND THE EXTRA HEAT BUILD UP JUST AFTER THE TV IS SHUT DOWN IS CAUSING THE POWER SUPPLY TO BE IN A SHUT DOWN MODE WHEN POWERED UP THE NEXT TIME. BEEN TWO WEEKS NOW AND WORKS PERFECTLY NOW AGAIN.

Dec 17, 2009 | Hitachi 42HDS69 42 in. Plasma Television

1 Answer

Hi in my apc es 500 the amber and green light is alternatively flashing and my ups is not working on battery power it is shutting down automatically plz help


Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. including the number of times the unit must go on battery power and environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault.

These lower powered and cheaper type UPS are switch over types, when the mains supply fail, the UPS switches over to the battery and inverter in milli-seconds which then supplies mains power. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.

Nov 12, 2009 | APC Computers & Internet

1 Answer

When UPS is shut down the lights go out on front pannel but power remains on plugs. It is coming from the AC side not the battery.


The UPS has a fauly/problem.
If your UPS is approx. 600VA, then it is not a true UPS unit but a switch over type. When the mains power fails the UPS switches over to the battery and inverter in milli-secs to provide mains power.
If you turn off the mains supply and shut down your UPS, but you are still getting mains power, then there is a fault with the switch over circuit.
You need to get this unit serviced.

Oct 12, 2009 | NEC APC Smart-UPS 1400 (050-01803-000) UPS...

1 Answer

Pc keeps randomly powering off & then back on. Won't stop until I unplug it.Holding down power button won't shut it off. On occasion it will stay on - is able to boot & be used normally while it...


Power supplies usually are culprits in random shut downs, but random start ups is a bit more complicated. You say that when you hold the power button, the computer won't power down. Perhaps you have a faulty switch? Make sure your PW switch cable is securely attached to the motherboard. But I'm leaning more toward a faulty switch or a short in the wires. Seems like a good place to start.

Sep 05, 2009 | E-Machines eMachines Desktop PC

2 Answers

I am having problem in starting up my system.once system has shutdown ,it fails to start immediately after pressing the start button.even after 2-3 hrs it does not start on pressing the start button.but...


Sir,
Let me tell you that do not use UPS current on to the computer as the current in UPS is (AC) it would blow whole of the power supply or might effect to your Computer processor. As now you are suggested to get new power supply. hope fully this would work

Aug 30, 2009 | Computers & Internet

2 Answers

UPS shuts down when the mains is off.


Hi

After 3 years, i would by a new UPS...

The battery will have to be changed if you want to keep the old one.

What i've seen mostly here in south africa. When the battery life has ended they customer opens the ups and takes out the battery and then connects a car battery to the terminals. The then close the ups and let the car battery stand outside the ups.

Hope this info helps...

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