> For the complete documentation index, see [llms.txt](https://help.sbtinstruments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sbtinstruments.com/troubleshooting/other-problems/does-not-power-on.md).

# Does not power on

The display stays dark when you switch your BactoBox® on.

You flip the rocker switch to *On*, and the display never shows the SBT logo.

Did your BactoBox® start, and then freeze or go dark? See [Display is frozen or dark](/troubleshooting/other-problems/display-is-frozen-or-dark.md).

{% hint style="info" %}

### The power indicator

The power indicator is the green LED on your BactoBox®, marked *H* in the image.

<img src="https://1589625940-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQorx08wID6YNpw8pEV0j%2Fuploads%2Fgit-blob-263e61e909721cf242ef89cb407cdf22f7aaf7de%2FBactoBox-outline-right--G-to-J.png?alt=media" alt="Right side of BactoBox®. H marks the power indicator." data-size="original">
{% endhint %}

## The power indicator stays off

{% stepper %}
{% step %}

#### Check the power cable

Check that the power cable is fully inserted into your BactoBox®.

<figure><img src="https://1589625940-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQorx08wID6YNpw8pEV0j%2Fuploads%2Fgit-blob-aeb6bf08bbd19dc81b560221bab55d7bf2f7625e%2FBactoBox--simple-outline--insert-power-cable.png?alt=media" alt="The power cable fully inserted into BactoBox®" width="375"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

#### Check the wall socket

Check that the power supply is fully inserted into the wall socket, and that the socket is switched on.
{% endstep %}

{% step %}

#### Check the power supply

The [power supply](/item-register/bactobox-r/bactobox-r/in-the-box/power-supply.md) has a green LED on top. If it does not light up, you need a new power supply. [Contact support](/troubleshooting/contact-support.md).

<figure><img src="https://1589625940-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQorx08wID6YNpw8pEV0j%2Fuploads%2Fgit-blob-d35dd54289195b1a54f6a0f842654653c67b3f73%2Fphoto--power-supply.png?alt=media" alt="Power supply"><figcaption><p>Power supply</p></figcaption></figure>
{% endstep %}
{% endstepper %}

## The power indicator lights up, but the display stays dark

{% stepper %}
{% step %}

#### Check the type of power supply

Your power supply must have a green LED and a smooth, flat top. An older type looks different. If yours does not match, you need a new power supply. [Contact support](/troubleshooting/contact-support.md).

<figure><img src="https://1589625940-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FQorx08wID6YNpw8pEV0j%2Fuploads%2Fgit-blob-2278987e1e183300c094b4bb335bf7d8291fd30d%2Ffile.excalidraw%20(1).svg?alt=media" alt="Current power supply (left) and older power supply (right). The current one has a green LED and a smooth, flat top."><figcaption><p>Current power supply (left) and older power supply (right).</p></figcaption></figure>
{% endstep %}

{% step %}

#### Contact support

Your power supply matches? Then it is most likely a hardware issue. [Contact support](/troubleshooting/contact-support.md), and tell us about any damage you see.
{% endstep %}
{% endstepper %}


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