Any one know?

the computer may have a problem, it would be a good idea to have it checked

Needs a circuit board or a new screen, you can't do it yourself.

Nothing you can do yourself.

when you thread the machine make sure to use every thread guide
check to see if the bobbin is in correctly
try changing the needle--normally flat side goes to the back
the needle that your sewing with is it the right one for the thread & fabric
clean under the needle plate & bobbin area for lint or loose threads

look for a disconnected wires should be a white block if that fails may be a damaged board, can be expensive to fix.

It could be a timing problem - the bobbin thread must be carried through the needle thread at a precise point in the needle's up-and-down cycle. 

Look for your manual and see if it tells you how to adjust the timing. 

If you don't have a manual, I found on for my 1960's machine on ebay for $8.

If neither of the above work, take it to the repair shop for adjustment.

RE: Euro-Pro 9000 Mechanical Sewing Machine "Won't Sew"

I am wondering if you tried unplugging it for at least 1 minute to let it reset the onboard computer (sometimes they need to be unplugged overnight).

Try the following links....
.
FAQ @ http://www.euro-pro.com/europro/faqdetail.aspx?modelno=9000

Manual @ http://www.euro-pro.com/europro/manuals/9000.pdf

Customer Service @ http://www.euro-pro.com/europro/feedback.aspx

Let me know if I can assist further!
jackiaria

Try here, https://www.sewingpartsonline.com/janome-mc4000-sewing-machine-parts.aspx or try Janome them self .

Here are some common reasons that the fabric won't feed:
1. Stitch length is set to zero, or machine is in button hole setting
2. Feed dogs are dropped (free motion setting)
3. Broken gears (typically in old singers)
4. Presser bar not coming down - may be bound up.
5. Lots of lint under the needle plate (in between the feed dogs) preventing feed dogs from raising.

Hope this helps.

Try using a walking foot. It could be it's not the bobbin but the way the two layers are feeding together. Or, change feet. Or, try a new needle. Rethread the top needle, too--sometimes this alone fixes the problem.