[PS3 fat] accidentally messed something up, no audio or video.

Hello. I was dumb, and 17, and decided to partially take apart my fat PS3 to clean the dust out. I got it clean, but it blinked yellow, then red until I turned it off.
I came back to it now after around five years of it sitting on the shelf. I tightened the connections that I could, and put it back together, and it boots, but there’s no audio or video. The most it was opened up, to my recollection, was the disc drive being taken off, and pressurised air being blasted through it to get around 15 years of dust out. Is there anything that I can do to get it to work? I tried starting it in safe mode, but to no avail.