Hello,
I can't switch on my Boox 92 anymore

Yesterday I used the reader the last time. It worked perfectly.
Possible defect:
Some Weeks ago I noticed that a small peace of something is clattering inside my reader. Because the reader worked fine I didn't send it for repairing or something else. Also I was afraid of disassembling it because of the guarantee.
Today I opened the reader and found there
two loose screws inside! This screws should hold the mainboard of the reader. How could this happen?!
I can imagine that this screws have caused an short-circuit? Although I can't see anything suspicious on the mainboard.
I have photographed the two positions where the screws should have sit.
What can I do now?
I bought this reader from ereader-store.de in December 2011.