I've got a Canon 30D. The pop-up flash isn't working even in automatic mode in dark conditions. I know there's a micro-switch under the hot shoe that gets stuck sometimes. But I can't find it.

SOURCE: Broken Hot Shoe

This link gives step-by-step instructions with pictures for replacing the shoe.

http://planetneil.com/tangents/2007/05/31/repairing-the-canon-580ex-hotshoe-foot/

SOURCE: A550 powershot flash not working

we all need new flashes it costs 90 bucks to replace it

SOURCE: sandisk cruzer micro code 10 error

This can be due to a internal problem,,,also can be avirus
The light should be in solid state i it's working right...and blinking only when a transaction is happening

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Sujith Gopinath

• 170 Answers
• Posted on Sep 02, 2010

SOURCE: canon 30d with tamron af 70-300mm di macro lense showing error 99

'Error 99' indicates some problem with the AF contacts. This is a common error in Canon lenses. It could indicate a very simple problem like dirty contacts or a much serious one like the breakage of USM cable. Alternately, it can also be a card error or camera error.

First remove the lens, battery and card and leave the camera like that for about 30 min. After that, insert a fully charged battery and switch on the camera. If the error still shows up, it is a fault with the camera and has to be serviced.
If not, turn the camera off and insert the card. Format the card in the camera and depress the shutter button. If it shows an error, the card is faulty.

If not, try cleaning the lens and body contacts (the metal contacts between the lens and body) using a pencil eraser. Be careful to hold the body facing down so that no dust falls inside. After cleaning both the lens and the body contacts, re-attach the lens and try shooting.

If the error still shows up, you need to take the lens to an authorized service center.

SOURCE: Hot shoe plastic section broke on flash unit

I managed it by buying a broken (non-working) F32X from an auction service for something like 5 bucks. I just made sure (by looking at the photos) that the hotshoe was intact.

Here's how to disassemble and replace foot (I got to this by trial and luckily no error ^^).

1. 
   Unscrew 2 small screws located under the battery flip cover.
2. Put the lamp (moving part) in the upright position.
3. Unscrew 1 small screw above the infared sensor (below the main lamp part which you moved to the upright position).
4. Remove the cover of the infared sensor by gently pulling forward.
5. On two sides of the infared sensor there are two small clips which hold the 2 casing pieces together. Pull them away from the casing just a tiny bit and use something to keep them in this position (I used 2 small nails). Then pull the pieces apart gently.
6. Just behind the hotshoe casing you can see a small plastic inset -- place a screwdriver sideways between this inset and the hotshoe to help you separate the two casing parts. Be careful when doing that, don't use too much force, wiggle the casing instead to make this easier (this is the most tricky part).
7. When the electronics is exposed, there is a single screw in the middle of the motherboard. Remove the screw and gently pull the motherboard away from the casing. You do not have to pull it all the way or disconnect any cables, you just need to make sure the bottom battery connectors are pulled out of the casing just a little, because then under the two middle battery connectors (looking from the top, as if you were putting the batteries in) you can see two screws!
8. Unscrew those two screws, and the hotshoe will come apart. Pull it out gently and remove a single electrical connector that connects it to the flash.