PC does not acknoldge on/off button. I have changed power cable and checked all power switches and buttons.
Before this I had difficulty shutting down the PC and also if you held the on/off switch in to reset there was no response.
It seems your motherboard doest get powered or your on/off switch is not working.
please check the power supply if its fan is working ,if it is working please open your PC's cover and you can find the power switches on the motherboard. i want you to shortcut the power pins.
how you can find them ? you can see these pins at the corner of your motherboard . if you can find and shortcut the pins ,and if your power supply works ,then i think problem is your motherboard. you should replace it .
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Are you saying that when you press the power button your your desktop pc, and nothing comes on at all? Or is it that the computer does turn on but nothing appears on your screen??? If you recieve nothing at all when pressing the power button on your desktop... Then you may want to assume that it is the powersupply. But before that, check for power cable connection to see if it is loose and fully pluged in. In some computer there could be a switch behind the computer where your power cord plugs which is the power supply and it might be switched to off. If not check to see if the powerbutton is loose, or sticky. If it is, that might trigger to computer not to turn on, and if everything seems okay.... then it is your power supply which had died. But if your computer does turn on and can hera the fans blowing, then you might have couple of cause that causing the computer not to boot probraly. If you can a change explain it in more detail please.
1. Switch off the Canon MX300 and disconnect the power cable.<br /> 2. While press and hold the power button, Connect the power cable to electric socket.<br /> 3. While pressing the power button, press the "Cancel/Stop" button (red button).<br /> 4. Now release the power button and the printer turns into a kind of factory mode. Wait for 10 seconds until it says "idle".<br /> 5. Press ">" (next button) once "Shipping Mode 3′ then Press the "OK" button. Press "OK" again for "without cleaning".<br /> 6. A test page will print.<br /> 7. Open the cover, like you are about to change the cartridges.<br /> 8. Disconnect the power cable again without switch off the printer.<br /> 9. Take out the both cartridges.<br /> 10. Close the cover.<br /> 11. Connect the power cable and turn on the printer.<br /> 12. Now just put the cartridges back and the ink level in the canon Pixma MX300 have full again.
Check that the power socket switch is on
Make sure your scanner's power cord is securely connected to the scanner and a working electrical outlet.
If your scanner is supplied with a power adapter, make sure
your scanner's AC adapter is securely connected to the scanner and a
working electrical outlet.
Make sure that the power outlet works. (If necessary, test it by plugging in another electrical device and turning it on.)
Check that the power switch is on at the mains socket. If this
is on, carefully check the power cable to ensure it is not damaged and
remove then reseat it before attempting to turn the scanner on again. If
your scanner has a power button, make sure that the button is depressed
so it is turned on. Also, make sure that your outlet works and is not
controlled by a wall switch or timer.
Power off the scanner at the mains socket. Unplug the power
cable from the socket, then remove and reseat the power cable from the
scanner's power cable port. Plug the scanner back in at the mains and
ensure the socket is switched on.
If your scanner has a power button, does the power button depress when pressed?
Press down firmly on the power button, if it is stiff and does not depress then there may be a problem with the button.
Connect the scanner directly to the mains - not via a surge protector or extension lead.
If your unit is connected via a surge protector or a power strip/extension lead, connect the unit directly to the mains socket.
Try another suitable power cable.
Check that other electronic devices connected to same power socket
have power and try another mains socket and another power cable if
necessary. Failing this try another suitable and known-working power
cable. Depending on your scanner, a standard "kettle lead" or "figure of
eight" power cable is used. If there is power to the scanner (indicated
by an illuminated Start light), when a different power cable is used, then the fault is with the original power cable.
If the unit does not power on after following the checks above,
contact Epson for support. If your scanner uses an AC adapter, then this
may need to be replaced. If your scanner is over 12 months old, you can
purchase a replacement AC adapter directly from Epson.
try this step:
Turn off the pc
remove cables and battery on the laptop
Press and hold the power button for 5 seconds
Reinsert the cable and battery
Turn on the pc
If the screen won't turn on, check the power button of the monitor if it is on.
If it does not, please call the tech support of Acer 1-800-816-2237 for possible replacement of battery...
If your computer is not switching ON you can try the following in order
1.you have to plug the power cable properly then try changing the power cable.
2. Check C P U power Button is working this can be done by opening the cabinet and switching the computer on by touching the two power button front panel pins on the motherboard with a screw driver if the computer gets started then it is the promblem with the power button in the cpu
3.Try replacing the SMPS with a new one
4. Finally change the CMOS Battery
Make sure the switch on the back of the power supply is set to the position that has the line on it.
If you still can't get any power, then try another known good power supply, if you still don't get any power then you know the motheroard is bad.
This is typical of a failed power supply. Look on the back of the power supply, there may be a red switch for input voltage. Unplug the power cord, flip that switch a few times and then plug the cable in and try again. If nothing changes, see if there's a small black button on the back of the power supply. If there is, unplug the power cable and press the button and hold it for 10-15 seconds. If an LED flashes or turns on, then plug the cable back in and try again. If this all fails, replace the power supply.
First things first:
1) You just change the power on button for other, on Radio Shack they have it.
2) cables that came from the motherboard to the ON/OFF SW. you have to soldering with the new Power Button, thats it. very easy task! you can use any power botton to fix this.