Motherboard replacement acer aspire m3641 Micro atx

[adamash]

I need a replacement motherboard for my Acer Aspire m3641 desktop, how can I find out which mobo to get? I have opened up the case and I can't figure out what the current motherboard is, so either get another that's similar or the same one as a replacement, many thanks in advance.

 

[adamash]

The CPU is a intel pentium e2200 dual core, I think the socket type is 775, any idea what motherboards are compatible with this system, acer want £52 just to look at my system and won't tell my anything about it over the phone!