Power issues My home build computer developed a power issue. When I turn the power supply on. The computer does nothing,(as normal) for about 2 seconds, then it starts by itself (or so it seems) only for about 2 seconds. At this time the power button does nothing. If left alone (power supply still on) for about 10-15 min, then move your hand close to the power button, it spurts back on for about 2 seconds, then off again. What's up?

https://www.usa.canon.com/internet/portal/us/home/products/details/printers/support-imageprograf-printers/imageprograf-w8400&ved=2ahUKEwiU3tHZv7fhAhVJqJ4KHURHBjMQFjAAegQIAxAC&usg=AOvVaw0BqE67DaH_DPsK8OFrAMgv

Power supply maybe but sounds like a motherboard issue. do you have a red light blinking on the front if so motherboard is your issue.

The blinking CH means that the Developing cartridge not installed.
Here is how to correct the issue:
1)Turn OFF the power of the machine.
2)Open the front cover.
3)Install the developer unit and toner cartridge.
4)Turn ON the power of the machine with the cover opened.
5)Enter Sim25-02. (Entered value display section: "CH" is displayed. Start LED: OFF)
6)Close the front cover. (Entered value display section: "--" is displayed. Start LED: ON)
7)Press [START] key to execute Sim25-02.When [START] key is pressed, the main motor rotates for 3 minutes to determine the toner sensor reference value and clear the developer rotation time as well as to clear the developer counter.When the operation is completed normally, the ATC sensor reference value is displayed on the entered value display section. If an error occurs, one of the following indicators is lighted. LED Misfeed indicator Paper required indicator This simulation must be executed only immediately after installing developer, Do not execute this simulation for any developer which has been used. If the machine goes into the warm-up state before completion of this simulation, there is a possibility that toner may be supplied to the developer during warm-up. In such a case, therefore, the developer must be replaced with new one.

Is your power supply large enough? It sounds more like too many amps are being drawn or the power supply has a problem. New power supplies are not as good as the "old" ones and develop some strange issues, like not enough power (amps) actually getting through. I assume heavy gauge wire. How many watts are you transmitting with?

hmmm..disconnect from computer completely. Then simply turn off power for around 5 min. Then just plug in and power up(no computer connection). I've seen this too. It MAY be related to a heat issue. Make sure there is NOTHING on top where holes are for cooling.

This could be caused by 1 of 3 things. 1. Your power supply is failing and needs to be replaced 2. Your computer is overheating or thinks it is 3. Your power button could be sticking
The last one is the easiest to check. -when you press the power button does it stay in or does it pop out as normal. If it pops out move on
Heating issue -Remove the size cover and check for excessive dirt build up --If yes, use canned air (do not hold can at an angle as it may cause the propelling liquid to come out and damage components) -When you power on the computer look inside does the fan mounted on a big circuit board (motherboard) spin --If it does not the fan may not be plugged in all the way or just bad and you will need to replace it -Check the BIOS, a lot of BIOS will show you the computer temp --This will be accesses from the first screen you see with text (Usually Award or Phoenix BIOS)
If you have tried all this I would replace the power supply -You can buy them from Best Buy for about $40 and return if it is not the issue. Here is a nice guide on how to install power supply http://www.hardwaresecrets.com/article/362

It sounds like either a power supply issue (most likely) or an inverter issue. The inverter can develop a short and cause the power supply not to start. Check the power supply first though.

It can also beep an error code.
Like 2 short beeps and no video - memory problem.....etc.

Symptoms of a Defective or dying Power supplies on LCD TVs.
1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.
2. TV not turning ON properly.
3. TV turns OFF by itself.
4. Needs to be unplug to many times to make it work.
5. Humming or high pitch noise heard through speakers or at the back of the TV.

I repair these power supplies. Write to [email protected]