LED keeps blinking.

[dakata1337]

I've got a Fujitsu esprimo p710 and its running great but there is a blue led light below the power button that just keeps blinking. Its not a problem most of the time but i cant leave the PC to download at night for example because the light is annoying (PC is close to my bed). What could be the reason for it ?

https://imgur.com/a/Y3kpuX7

 

[CountMike]

If blinking is not regular it's probably disk activity light.