Green light for flash doesn't come on

i could be that the rechargeable batter is weak. try replaceing the battery for a new one. also check that the connections for the battery are clearn.

I hope this was useful.

The SB600 isn't made any more. I would recommend the SB700. Before you buy an external flash however, make sure that the hot shoe on you camera is still fully functional. An external flash is superior to the pop-up flash under almost any circumstances. Where your pop-up flash limits your shooting distance substantially, I have take pictures at night using an SB700 almost 100 feet from the subject and gotten correct exposure with my D90. Now there is one thing you will not be able to do without the pop-up flash, but I suspect it will never matter to you. You will not be able to use the pop-up flash to trigger the SB700 off camera.

Green light flashed, turned red, lens would not open. Put in new rechargeable batteries, still nothing. Someone here suggested to try regular AA cheapie batteries. IT WORKED!

Besides the auto-flash mode, you can select fill flash, flash off, self-timer, and nighttime-view with or without flash.
Press the MODE-SELECTOR BUTTON until the desired indicator appears on the LCD PANEL.
Fill flash and flash off modes remain selected after you take the picture. To cancel the selection, press the mode-selection button or close and reopen the lens cover/flash to return to the auto-flash mode.
Fill flash
When bright light indoors or outdoors comes from behind the subject (backlighting), dark shadows (especially on faces) may occur. Use fill flash to lighten these shadows.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the FILL-FLASH INDICATOR appears on the LCD PANEL.
3. Frame your subject within the VIEWFINDER EYEPIECE.
4. Partially depress the SHUTTER BUTTON. When the FLASH/CAMERA-READY LAMP turns off and the fill-flash indicator on the LCD panel stops blinking, fully depress the shutter button to take the picture.

Flash off
When you do not want to use the flash, especially indoors where flash is prohibited, such as in theaters and museums, or when you want to take twilight scenes or distant subjects that are beyond the flash range, or capture the ambiance of existing light, use the flash-off feature. Use a tripod or place the camera on another firm support, and use high-speed film because the shutter speed in these situations will most likely be slow.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the FLASH-OFF INDICATOR appears on the LCD PANEL.
3. Frame your subject within the VIEWFINDER EYEPIECE.
4. Press the SHUTTER BUTTON to take the picture.

Self-timer with auto flash
Use this feature to include yourself in pictures.

1. Use the TRIPOD SOCKET to attach the camera to a tripod or place it on another firm support.
2. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
3. Press the MODE-SELECTOR BUTTON repeatedly until the SELF-TIMER INDICATOR appears on the LCD PANEL.
4. Frame your subject within the VIEWFINDER EYEPIECE.
5. Press the SHUTTER BUTTON. The SELF-TIMER LAMP will glow and then blink during the last three seconds of countdown.
   • To cancel the self-timer selection before the shutter releases, close the flash.
   • The self-timer automatically turns off after the shutter releases.

Night-view with flash
In this mode, the camera balances the flash and existing light exposure so you can take beautiful pictures of people at sunset or at night. Use a tripod or place the camera on another firm support, and use high-speed film because the shutter speed at night will most likely be slow.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the NIGHTTIME-VIEW INDICATOR with flash appears on the LCD PANEL.
3. Frame your picture in the VIEWFINDER EYEPIECE.
4. Press and hold the SHUTTER BUTTON for 12 seconds without lifting your finger. Note: If you remove your finger from the shutter button before 12 seconds, the shutter will time out immediately.
   
5. After 12 seconds, release the shutter button to take the picture.

Night-view without flas
In this mode, you can capture the natural existing light of city-night scenes or fireworks at night. Use a tripod or place the camera on another firm support, and use high-speed film because the shutter speed at night will most likely be slow.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the NIGHTTIME-VIEW INDICATOR without flash appears on the LCD PANEL.
3. Frame your picture in the VIEWFINDER EYEPIECE.
4. Press and hold the SHUTTER BUTTON for 12 seconds without lifting your finger. Note: If you remove your finger from the shutter button before 12 seconds, the shutter will time out immediately.
   
5. After 12 seconds, release the shutter button to take the picture.

get a butter knife or any thin object like that and use it to push out the lens and turning it on at the same time  you will hear a clicking noise which is normal  once completely out, use your hand with a gentle but firm presure move it form left to right 
and then hopefully it should work after that 
x

Remove the lens from camera.
Look inside pass the mirror, how is the shutter?
Should be flat with the film with no warp or opened shutters.

Or try this:

Lens out, set camera to M (manual mode).
Shutter set at 1 (One Second).
No flash.
800 ISO
Lnes drive pin (recessed) fully into the body, not S or C.
Fresh batteries.
Set self timer on.
Press shutter button.
Camera should blink and then shutter should be tripped.

This will also check to see if you have enough power for min. of one shot.

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you left it too long for a free replacement
But it is worth contacting Olympus as it is know this one was a lemon.

you are going to have to send it in to the repairs dept. Their phone number is listed on their internet site under support and then "contact us"

push the button all the way down- a half push is just to test the range

the flash circuit of the camera is short. the moment you switch on the flash it drops the supply voltages of the battery. you have to show it to a repairer.