I have a 5-year-old Whirlpool Gold side-by-side fridge/freezer model GC5SHEXNB03. A week ago it was working fine, the power was shut off for four days and now it doesn’t cool at all. The lights are working, there is a slight hum for a few seconds after the power is connected, but no fan/compressor doesn’t ‘kick in’. 
Any help would be appreciated. I have a great fear of spending lots of money on a call-out only to be told I should just replace my 5-year-old fridge (or spend a lot of money on it).
Can anyone help?