Dvd-5820 I put the disc in and it says loading but wont' do anything else. It also knows when there isnt a disc can you tell me what to do?

First try different DVD discs. All players of DVD or CD are likely to fail in this way over time. You can try to clean the lens inside the unit, but it may not fix it. Its wise to buy the cheapest replacement, because they never last much longer than a year.

The only solution is buy a DVD disc cleaning kit and follow the instructions, this will clean the plastic lens and maybe get it back in working order. Second option is to buy a cheap DVD player in hopes the back of the set has the proper audio and video input jacks.

Make sure autoplay isnt turned off in windows.

try cleaning the lens first.then load a disk.try a different disc like VCD, CD etc.if only the DVD's are not read, the lens and the mainboard itself is faulty.but, if after cleaning it, it goes ok ,then its just dirty.

anyone having problem sharp aquos bluray reading disc just call 1-800-be-sharp to update your player you will need a computer and a usb 2.0 drive , so you can load update from computer to drive then pull drive from computer to the back of player load load it to player , they tell you all you need to know

try to clean the lens using cd cleaner or cotton buds with drop of water on it. that really works.

sometimes this happens. now. the dvd you put in was it rewritable. a friend could not run his dvd recorder until i gave him a dvd+r rw disc in and lo, it worked.
some dvds have this function without telling you, perhaps it is in the instructions in small print. 
also, try a straight dvd+r disc, not a rewrite. experiment with other discs because some will not see cheap discs but expensive ones.
i have dvd that does not even reconise a dvd, but when i wish to burn a dvd, i use that one because it is the best.
strange isnt it...

I have the same problem, wont read anything in the drive. It is a master and there is no slave dirve so its not that, jumpers etc checked, drivers, cables. Just wont work.

sound like the lazer drive unit is faulty.
Expensive to fix.
My suggestin is by a new one.