no green light showing
have red light but no green light
There are 4 LEDs, on the pi, two for the Ethernet port, and two separate ones. I assume you mean the separate ones, as these indicate power.
Red is for power on. It being constantly on is nothing but an indicator that you raspberry pi is getting power. Its connected directly to the power source, and does not indicate any code running on the pi.
Green is for SD card. It being off indicates that your SD card is not properly set up to boot the PI. follow the instructions for NOOBS to properly prepare your pi.
I believe the green light signals network activity. Plug it into a network and send it some data. See if the green light blinks.
From what I can tell, the red light is normal. I also don't own one but from online pictures it's red light...
The green light next to the red light as a data activity light. If this light does not start flashing at power on if the SD card is prepared correctly , once system loads the light stops flashing and waits for activity.
== how to add too fans. ==
Your SD card may be dirty; try cleaning it with your thumb. It didn’t work for me, but it will probably work for you.
if the raspi works, just don’t bother about the lights.
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