Hi darrk , how long have you owned the pc , the reason i ask is because i am in the england and i have a custom built pc , i got it 6 years ago but after the 3 year extended cover was up i asked if i could extend it. The answer was no but they said anytime you have or think you have a problem please feel free to email us.
So , if you have an invoice number that will prove you are a genuine customer , failing that phone them with your details and ask if they will help you if you send an email anyway.
DONT send an email asking for help with your name and address on it , you never know where you information might end up.
Also dont tell them you fitted something yourself because some builders dont like it when you fit something yourself.