i have rawsberry Pi 3 model B - I installed it successfully once using noobs hdmi disply and combined mouse/keybord with dongle.
Evrithing worked fine until I tried to install the camera. I shut it all down with the menu, inserted the ribon cable to the camera slot and rerun the system on. the displey showed that i loaded the rawsberian but i didn't got signal form my keybord. Without stoping it i removed the dongle form the usb and inserted it back. it still didint worked. i shut down the power from the botton, but when i turn it on the diplay was saying no signal. then i removed the card and started the device without it. it was only red led. i switched it off inserted the card back and i got strange paterns on the screen. i switched it off, hard-formated the sd put agin a clean version of noobs for reinstal but the display says no signal. the fan is working and the green light is indicating 3 short and one long blink.
Is it a breakdown or there is sugestion for a fix?
After reading a lot more i tested out all polyfuses to find out that all connected to the USBs have blown.(maybe this exaplins why i didn't have keybord when i installed the camera) However in theory they shal reheal themselves in several days ... I hope? A lot of guys are shor sicuiting them. What could happen.