In-built flash stuck in up position
Indeed: "which camera" would be very useful starting info!
Anyway, years ago on a 10D I had a similar problem, and it turned out that the hook that goes down into the body couldn't engage because a wire had got out of place inside. Not that this is the explanation for your problem, but I can't think of anything better than to say "take it to a repairer".
|Autumn by valenttin|
from Harvest Festivals
|Cardinal, Male by paul katinas|
from A Big Year - birds
|.. by Amar Vignesh|
from Unintentional Blur
|Sir Mick Jagger by HetFotoAtelier|
from - Concerts : When The Lights Come On -