problem with blender, please help!

i’ve got a problem with blender: my model suddenly became invisible. I tried to press the <´> key, which turns all layers to visible, but it won’t work!
I tried to save it and reopen it, but it won’t work.
I also tried to use the bottom window as 3D window, and i saw my model. I compared the settings of the 2 windows, and they looked the same…
btw i included a screenshot:



does enybody know how to display it in the top window again

Hi,

Snap your cursor to your object (select the object and press Shift-S>Cursor–>Selection) in the bottom window. In the top window, press C.

it made it dissapear in both windows…
screenshot:


Hi,

Press N. Check where your object is located. Set it to 0,0,0 (or clear location with ALT-G). Then try snapping your cursor to it again and use C to recentre your view.

it somehow jumped to location #QO,#QO,#QO , and i can’t change those cordinates. Even ALT-G won’t work…

Hi,

Create a new file and append your object into the new file.

how should you do that?