<p>Just after I posted this I tried swapping various components with my other Ender 3. </p>

<p>It turns out a faulty power supply will produce this effect. When I swapped out the power supply it started normally.</p>

CC BY-SA 4.0
2018-11-22T23:52:24.430Z
2018-11-22T23:52:24.430Z
iCollect.it Ltd
<p>Just received my second Ender 3 (see my other questions for the problems that first one developed). Figured it best to have a spare while I upgrade my first one with an ABL. </p>

<p>I assembled it as normal, without any issues, but on applying power the LCD screen just flashes on and off continuously along with the blue LED on the main board. See photo. </p>

<p>When I power it off, the Ender 3 logo appears briefly before it goes black. I am in the U.K. and running 240v setting. Is this likely the power supply or the motherboard? I already tried another screen and same problem. </p>

<p><img src="https://i.sstatic.net/n7NN4.jpg" alt="enter image description here"></p>

CC BY-SA 4.0
2018-11-22T22:28:42.097Z
Do you have a separate main board you could test on it? Have you tested the power supply to ensure it's putting out the right voltage?
Pᴀᴜʟsᴛᴇʀ2
CC BY-SA 4.0
2018-11-22T23:52:57.733Z
@Pᴀᴜʟsᴛᴇʀ2: Was trying another power supply immediately after I posted. It was a faulty power supply. Will have to find a replacement now. Thanks
iCollect.it Ltd
<electronics><creality-ender-3><power-supply>
Ender 3 Won’t Start - flashing screen and blue LED on main board
iCollect.it Ltd
# Ender 3 Won’t Start - flashing screen and blue LED on main board

(Asked by: username_0 on 2018-11-22)

Just received my second Ender 3 (see my other questions for the problems that first one developed). Figured it best to have a spare while I upgrade my first one with an ABL.

I assembled it as normal, without any issues, but on applying power the LCD screen just flashes on and off continuously along with the blue LED on the main board. See photo.

When I power it off, the Ender 3 logo appears briefly before it goes black. I am in the U.K. and running 240v setting. Is this likely the power supply or the motherboard? I already tried another screen and same problem.

![enter image description here](https://i.sstatic.net/n7NN4.jpg)

**Tags:** electronics, creality-ender-3, power-supply

> **Comments:**
> **username_1**: Do you have a separate main board you could test on it? Have you tested the power supply to ensure it's putting out the right voltage?  
> **username_0**: @username_1: Was trying another power supply immediately after I posted. It was a faulty power supply. Will have to find a replacement now. Thanks  

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## 1 answers

### Answer by username_0 on 2018-11-22. Score: 3 | Accepted answer

Just after I posted this I tried swapping various components with my other Ender 3.

It turns out a faulty power supply will produce this effect. When I swapped out the power supply it started normally.


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