I have an original 360 that's started having issues today. First, mid-game it went to a blue screen and had to be turned off. When I tried turning it back on the 3 red lights appeared. Out of curiosity I tried it again without the HDD and it worked fine. Putting the HDD back in and it worked.
Started to play a game again and this time the screen went black before having to turn it off. Trying to turn it back on caused the screen to freeze. Rebooting caused 3 red lights. [Note: it had 3 red lights without the HDD too.]
I've since tried the same techniques as before and it's up and running again. I haven't tried to play a game thinking it will probably just freeze.
Is there something other than a console repair that will help fix this issue? Or am I out of luck and need to send it in for repairs?