I have a Samsung HT-D550 Home Entertainment System. When I put a DVD or CD in they play for about 30-40 seconds and then stops and a display comes up and says "Franc HK". What can I do?

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This should solve it :) I had similar problem. Swapnil

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Turn on the HT with no DVD. Press the following buttons on the remote: ENTER 8, 4, 2, 6, 9 ENTER 
It will turn off. When turned again on it is a region free HT. 

SOURCE: "Protect" error - HTZ110

Home Theater System Is Displaying "Protection" As soon as the unit is turned on, the word "PROTECTION" will flash on the front panel of the unit and SHUT OFF. This error message usually indicates that the fan in the back of the unit is not on.

The PROTECTION feature automatically shuts down the unit to avoid further damage. The unit will need service if this error message is displayed.

Please use our ASC Locator to find your nearest Authorized Service Center

from samsung's web

http://www.samsung.com/au/support/faqs/supportFaqList.do?group=&type=hometheatre&subtype=hometheatresystems&model_nm=HT-Z110&dType=D&mType=UM&vType=R&prd_ia_cd=03030100&acc_ia_fl=&disp_nm=HT-Z110&menu=faqs

Ginko

• 19396 Answers
• Posted on May 04, 2009

SOURCE: SAMSUNG HT-TZ212 home cinema kit comes up with protect

Protect mode will kicking whenever a fault is detected.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

SOURCE: SAMSUNG HT-P10 DIGITAL HOME THEATER SYSTEM wont play DVDs

You could try cleaning the drive with a dvd cleaner disk and also a can of compressed air to blow into the drawer. It may just be dirty. Good luck! I hope this helps you.