Please Wait is flashing all the time. Unplug both pwr and USB for a day then plug in just pwr Plaese Wait still there. No lights for copy, fax,scan or photo. Pwr button does nothing and stop reset same result. Tried new USB cable nothing.
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Shut down the computer, disconnect ALL USB connections front and back.
Plug in just the keyboard USB cable and start the computer. If it does not work, try moving the USB plug for the keyboard and trying again. If you can't find ANY USB port that works, then your motherboard is probably fried.
Once the computer comes up with just the keyboard, plug in the mouse and wait for it to work (should be almost immediately). If it does not work in one USB port,try another until it works... wait several seconds after plugging it in before deciding whether it works or not.
Once you have a working keyboard and mouse, begin plugging in any other USB devices, one at a time and verifying that each device works. As with the keyboard and mouse, if it does not work in one port, try another.
Note that some devices may take several seconds or up to a minute to fully be discovered and set up and you may have to respond to something on the screen.
1 - power off. 2 - hold stop/reset ,hold ON/OFF 3 - release stop/reset, push stop/reset twice, quickly, then release ON/OFF 4 - wait untill LCD display shows "Canon Idle",then push stop/reset four times, quickly 5 - then push power twice, quickly 6 - power off and power on.
Check the USB ports for damaged contacts. If the supply powers up and then shuts down immediately, you have a critical error.
Damaged USB port contacts can cause this but so can graphics cards etc. Open the machine up and remove all cards and memory sticks and unplug all the drives but LEAVE THE CPU ALONE!!
Now, turn it on. If it boots and starts beeping ( which it will with no memory installed) shut it down and reinstall each item you removed one at a time and turn it on after each single thing. When it stops booting and does whats its doing now then the last thing you plugged back in is the issue.
If it still doesn't power up with everything removed then the issue is in the mainboard.
If this is th case, my advice is to seek professional advice..