Sony Discman D-E301 does not recognize disc

SOURCE: Took my 360 carefully apart to clean the eye. Put it back together light turns on then off.

its olk

SOURCE: HP Officejet 6110 Scanner Failure

I have had this problem too. Actually, I have had it twice. Thanks to this forum, I was able to repair my 6110xi both times --after having read innumerable postings by fellow scanner-error sufferers. The second time around I needed many hours of trial and error, though. I thought I had carefully cleaned each little piece of mirror in the scanner unit, to no avail.
It was only after reading that there are more mirrors inside the scanner unit that need cleaning that I ventured to open it up. This time, it worked!  
My conclusion is that many frustrated posters follow the advise of others whose scanning mirrors are not as dirty -and for whom a less thorough cleanup (like the one I did the first time around) was enough. Essentially, all the mirrors (inside and outside the scanner unit) need cleaning so that the unit can recognize the starting point where it needs to backtrack to. Oh, yes, also do clean the underside of the scanner glass!  
To open up the scanner unit, introduce a tiny screwdriver (flat is fine) in eac one of the slots at the top left of the unit. There is nothing to unscrew there. But you'll need to push the little tabs that attach the lid to the body of the unit. Then use the same screwdriver to carefully pry open the lid. Don't worry: if you don't use much force you won't break it.
The best bet to clean the glass and the mirrors is a microfiber lens cleaning rug and lens cleaning fluid.  
Mistakes I have made, from reading other posts: do not use Windex or similar glass cleaning liquids; and do not lube the rod where the scanner unit moves, or anything at all, with Tri-flow or any other kind of lubricant. The problem is not a mechanical one. It is strictly optical. 

SOURCE: Phillips 6500 "no disc". It

Install the latest firmware located on Philips website. Download to a DVD and the 6500 will do the rest. Good Luck.

SOURCE: the no disc sign keeps coming on the unit wont do

The iris needs a clean, get the appropriate cleaning disk or send it for service and clean to rectify the fault.
The cleaning disk is about $25 run it for 2 or 3 times and it should rectify the problem.

Thanks for usinhg FIXYA

SOURCE: loads disc and motor runs

Try cleaning the head guide shaft with alcohol and a Q-tip if you can reach it. It is the shaft that the head slides back and forth on. It will sometimes not let the head home and that is where the first track of information is that identifies the disk to the player.