The lens is blocked in and when I slide the cover the green light is blinking twice and no display.

SOURCE: Camera won't turn on, just beeps

first check the battery... charge or replace it... else reset the camera or repair

SOURCE: Lens cover slide Olympus D-520 Zoom

As far as I know, you can't

SOURCE: Blinking green light, lens not coming out, not able to take pics

I had the same issue with both my D550 and D560 that I just picked up. If you are using normal AA batteries, change to Lithium. Now both my camera's are working. I used to be able to use AA's but for some reason, the ones I have picked up recently were not strong enough. Worth a try at only about $10 for a 4 pack at your local Walgreens or CVS.

SOURCE: turns off due to sliding lens cover

may need to replace the screws in the door or even tighten them up

SOURCE: Regrding Olympus Stylus 500.. When turned on

Have just solved similar problem with mine. Problem turned out to be that the lens cover was very slightly dented in. It didn't really look dented at all, but just wasn't quite symmetrical and was a bit more recessed on the side away from the shutter button. This was causing it to rub on the case when it tried to slide. (Mine had been not sliding completely shut for a while before it stopped opening properly too).

To fix it I undid two small cross head screws which let the front panel be prised off. On mine, with the front panel off, the lens and lens cover mechanism all worked perfectly, as the problem was that the lens cover was rubbing on the front panel. If yours is still broken with the front panel removed, then your problem is not the same as mine...

I used a small screwdriver to push out the metal bar on which the top of the lens cover slides, pushing on the right hand end of the bar to slide it left and out through the USB connector compartment door. That lets the top of the cover come off the bar and move freely. To take the cover off, it has to be detached from the arm which moves it. There is a pivot trapped in a slot in the arm, but once the cover is off the bar at the top, it can be moved down so that the pivot reaches the bigger hole at the bottom end of the slot in the arm. This lets the whole lens cover come off the camera.

I then used a screwdriver to gently push out the middle of the cover until its shape was more symmetrical. (I'm not sure a screwdriver was ideal for this, as there are now tiny lumps in the cover where I was pushing it).

Putting it back together was the reverse of taking it apart, although you can test whether it's fixed or not before doing up the screws holding the front panel on.