> For the complete documentation index, see [llms.txt](https://commanderhelp.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://commanderhelp.verifone.com/general-help-guides/general-help/how-to-check-for-power/ruby-2-and-rubyci.md).
# Ruby 2 and RubyCI
#### Use this when the Ruby 2 screen is black or the RubyCI looks off.
The Ruby 2 register and the RubyCI have separate power.
*Check both units. One can have power while the other does not.*
Keywords
**Also called:** Ruby 2 no power, RubyCI no power, Ruby 2 black screen, Ruby register off, RubyCI off
**Keywords:** Ruby 2 power check, RubyCI power check, check power on Ruby 2, check power on RubyCI, Ruby 2 DC Power, Ruby power brick, Ruby black screen, RubyCI site controller
### How to check power on Ruby 2
{% stepper %}
{% step %}
#### Look for signs of power
Check for a heartbeat(HB), power light, or status display.
If you see any of these, the Ruby 2 has power.
{% endstep %}
{% step %}
#### Check the DC power connection
Go to the back of the Ruby 2.
Find **DC Power**.
Make sure the cord is firmly seated.
Do not unplug it from the back.
{% hint style="warning" %}
Do not remove the Ruby 2 power cord from the back of the unit. The connector has small pins that can bend.
{% endhint %}
{% endstep %}
{% step %}
#### Check the power brick and outlet
Trace the power cord to the power brick.
Make sure it is seated tightly.
Then trace the brick to the wall outlet or UPS.
Make sure that end is seated too.
{% endstep %}
{% endstepper %}
### How to check power on RubyCi
The RubyCi sits under the Ruby 2.
It is the site controller for that register.
Check power on the RubyCi separately.
{% stepper %}
{% step %}
#### Look for signs of power
Check for a heartbeat(HB), power light, or status display.
If you see any of these, the RubyCi has power.
Ruby Ci power
{% endstep %}
{% step %}
#### Check the power connection
Make sure the RubyCi power connection is firmly seated.
 
{% endstep %}
{% step %}
#### Check the power brick and outlet
Trace the power cord to the power brick.
Make sure it is seated tightly.
Then trace the brick to the wall outlet or UPS.
Make sure that end is seated too.
{% endstep %}
{% endstepper %}
{% hint style="info" %}
If the Ruby 2 has no power, the screen will be black and the touchscreen will not work.
The Ruby 2 does not lose power just because the RubyCI has no power.
{% endhint %}
{% hint style="info" %}
N**eed assistance? Contact Verifone Helpdesk at anytime.**
* Use our **Chat** platform
* Or call **1.800.VERIFONE (837.4366)**
Tell us the troubleshooting steps you’ve already tried. This saves time and gets you the right support faster.
{% endhint %}
### Related power checks
* [Check power on Topaz](/general-help-guides/general-help/how-to-check-for-power/topaz.md)
* [Check power on the UPS / Battery Backup](/general-help-guides/general-help/how-to-check-for-power/ups-battery-backup.md)
* [How to check for power](/general-help-guides/general-help/how-to-check-for-power.md)
---
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