Arduino uno with ethernet module and relay

vj01:
this relay is connected to the arduino

How exactly is this relay 'connected to the arduino' ?

when i connect the pc to the output of the relay then power up my pcb, everytime i send the command reboot it doesnt work.

Nothing at all ? No 'tick' from the relay? no LED's briefly blinking ?

i have a feeling it is due to the load when the pc is connected when powering up my pcb, but cant not be sure.

That seems highly likely.

Yours,
TonyWilk