Just paid £75 to order a repair for my Xbox 360!

I've had to pay £75 to order a repair on my xbox 360, I felt I had no option as it seems to have a big problem and a new one would still cost over £100 (xbox elite with hard drive older version). The problem is that the screen flashes on and off every few seconds no matter if there is a game in there or not, so it's on a few secs then the screen goes blank then comes back on for a few secs, the audio and visual was also shaky when it lasted worked for longer (not red rings). Does anyone know how to fix this or did I do the right thing in ordering this repair?
 

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