You haven't described the noise: it's key to understanding what's happened, but the fact that there's a noise at all suggests that it's not just a blown fuse (even if it was, fuses don't just blow without reason).
If the noise is a whirring motor sound, then the fault is with the drive mechanism. This could be stripped gears or a failed motor clutch.
If it's just a click, then an electric motor has failed, or the solenoid (the click) is not sending power to the motor. The latter fault could be a faulty solenoid or it could be a failure of any one of a number of microswitches which sense exact roof position at every stage so that the roof folds and unfolds in the correct sequence. One of the first things which happens is that the bootlid is commanded to open in order to receive the roof as it folds; this in itself is a complex process as there will be a separate drive motor and a number of microswitches involved.
This is not a DIY job unless you're a competent DIY mechanic who is confident with automotive electrics, and with all due respect, the fact that you've posted this question tells me that you're not.
The repair costs can be fairly steep: it all depends upon how much labour it takes to isolate where the fault is, and then the cost of getting to the faulty part and the component cost. A single microswitch is usually cheap, but this can be one of those jobs where the cost is virtually all in labour charges. If you're lucky, the fault will be found in a matter of minutes and the repair done just as quickly, but you'll still have to pay whatever the minimum labour charge is (typically an hour for mobile electricians and half an hour for those who are garage-based). If you're unlucky then the fault will be more complex such as a bent hood frame component which usually means that the whole roof must be replaced.
You basically have two choices: get the vehicle to a good automotive
electrician for diagnosis and repair or do as many owners eventually do
and live with a permanently closed roof.
If you choose the repair option then normally I recommend that it's better to get an independent repairer to fix this kind of problem, but there's no substitute for experience so you may find that a franchised dealer has seen this fault often enough to be able to zero right in on the likely cause. Although their hourly labour rates will be higher, a speedy resolution (or at least a diagnosis) may save you money overall. It is worth asking directly whether the garage employs it's own auto-electrician though, as many simply call one in as required. You then just end up with paying Peugeot for acting as the middle-man for someone you could have found yourself at lower cost. So phone around: find out who claims to have specialist cabriolet roof experience and whether they regularly work on your model.
The final point to consider is this: if you're in the northern hemisphere then spring is about to start, and the entire point of your car is the open roof experience. Even if you decide to sell the car with the fault and replace it with another, the used value of your car falls through the floor if the roof can't be operated.
Good luck with resolving this fault; I hope that my reply has helped you to decide what to do. Please take a moment to rate my answer.
Testimonial: "very helpful and detailed my noise is a motor whirring sound the car has had a rear bump in the past but was very minor could this be related"
Check to be sure all locks are released.
If all locks are released then you may just be low on fluid. remove the rear seat [ some you get to through the trunk or boot] - then find the small holding tank for hydraulic fluid and check the fluid level - top off if needed. Look for leaks while your there.
Also check for factory recalls on the unit before you spend your money to repair this -
Best of it
Testimonial: "very helpful and quick response i'm off to climb into the back now thanks mate"
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