Epson Expression XP-400
Just used it yesterday,but today push the power button and it will not power on

Experienced technical support provide their insights in answering this question :
If it is plugged into a power strip or surge protector unplug it and plug directly into wall outlet; check to make sure the power cord is fully seated where it connects to printer.

How to Identify and Fix Common printer Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Ensure that the power cord is correctly plugged into the printer and the electrical outlet. If the power cord is damaged, replace it with a new one. Try to plug the printer into a different outlet to rule out any issues with the outlet. If the power cord and outlet are okay, the next step is to check the power button.
Faulty power cords and connections are an uncommon but possible cause of a printer not turning on. Before suspecting a cord failure, ensure that there is power to the wall outlet and there are no conditions preventing the printer from turning on. Testing by substitution can confirm if a cord connection is the problem.
If you have an Ecotank printer, another possible cause of power issues is a faulty motherboard. The motherboard controls the printer`s various functions and may be the reason why the printer won`t turn on. In this case, you may need to replace the motherboard to get your printer working again.
Reset your Product`s Network Settings

Press the home button, if necessary. Press the arrow buttons to select Setup and press the OK button. Press the arrow buttons to select Restore Default Settings and press the OK button.

Printer sleep mode

Check that the printer does not have sleep mode enabled: Go to Control Panel > Devices and Printers. Right-click the printer in question, then select Printer Preferences. Look for an option to disable sleep or time-out mode.

Select On to wake the printer from sleep mode by tapping the LCD touchscreen or by pressing a button on the control panel. Select Off to wake the printer from sleep mode by only pressing a button on the control panel. This prevents unintentional operations due to objects bumping the LCD touchscreen.
Clean the print head, if necessary. Make sure the paper size, orientation, and layout settings in your printer software are correct. Make sure your document does not contain blank pages. If your printer software has a Preview option, you can check for blank pages before you print and remove them, if necessary.
If you do not turn on the printer for a long time, the printer may malfunction. If you will not use the printer for more than two weeks, maintenance must be performed by a service engineer before and after this period.
How to do a hard reset on your printer. With the cartridges still installed, power down the printer and then unplug the power cord from the wall. Wait for a minute, then plug the printer back in and power it back up. Wait for the cartridges to center and then try printing again.
To keep your printer lasting longer, we recommend leaving your printer on. If it is off for a long period of time or if you turn it on and off again regularly, the printhead inside the printer will dry out faster. When you leave it on, you may hear the printer start up every once in a while and begin to calibrate.
Yes, you can reset the print settings to their original, default values. Press and hold down the Cancel button for 3 seconds. When the message to reset the printer to default settings appears, press OK to reset the print settings.
Clean the print head, if necessary. Make sure the paper size, orientation, and layout settings in your printer software are correct. Make sure your document does not contain blank pages. If your printer software has a Preview option, you can check for blank pages before you print and remove them, if necessary.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Wont power on
ANSWER : If it is plugged into a power strip or surge protector unplug it and plug directly into wall outlet; check to make sure the power cord is fully seated where it connects to printer.

Read Full Q/A … :

Epson Expression XP-400

Epson Stylus sx130 Printer does not power on…
ANSWER : I have had the same problem with Epson px660. I have replaced the main board twice with the same problem recurring after printing many copies of documents..there are some transistors at the back of the main board which when removed the printer will power on but will not recognize the cartridge..so I’m still wondering of the power supply is short circuiting the main board…a

Read Full Q/A … :

Epson Expression XP-400

'wont print
ANSWER : http://www.brother-usa.com/FAQs/Solution.aspx?FAQI…

Read Full Q/A … :

Epson Expression XP-400

LaserJet 4 won't Power Up
ANSWER : I haven’t seen that particular behavior on that model. It either works or it doesn’t. My first choice would be the power supply.

Read Full Q/A … :

Epson Expression XP-400

paper drive wont accept paper
ANSWER : There is probably a small scrap of paper stuck at the left edge of the paper path. The paper hits it and skews to the left. The smaller size bypasses it. You need to shove something stiff, like a piece of file folder, down the paper path and attempt to dislodge it.

Read Full Q/A … :

Epson Expression XP-400

printer wont switch on
ANSWER : Time for a new printer.

Read Full Q/A … :

Epson Expression XP-400

HP psc 2110 all-in-one won't turn on after power o
ANSWER : left the printer on now i cant get the printer to go on

Read Full Q/A … :

Epson Expression XP-400

HP Deskjet 640c wont print??
ANSWER : yes

Read Full Q/A … :

Epson Expression XP-400