Hi All,
Had a spike and the motherboard is toasted. Anyone know where I can buy a new motherboard for a gateway DX4300-11?

Thanks
I would just find out which CPU you have and if it's a full size case shop for a MBoard acordingly...
You may want to consider the opportunity for a complete upgrade as well...SECOND Patio's motion. Not all motherboards support the same CPU lists.

Also, have you checked the POWER supply in the machine? If a spike has indeed occurred then this is usually the first COMPONENT to blow.
Also note that because of the nature of these faults the all, some or none of other hardware may also be toasted.

If you have replaced the PSU and confirmed that the motherboard is at fault;

Searching for your desktop model, your CPU is a AMD PHENOM II X4 805

Myself, I prefer Asus motherboards.

http://www.asus.com/us/Motherboards/AMD_Platform_Products/

Your current CPU is a AM2+ and AM3 socket.

Your motherboard is (according to gateway) a Foxconn (Bengal) RS780 Motherboard

This is a Micro-ATX board. (uATX)

http://www.asus.com/us/Motherboards/M5A78LM_LX_PLUS/#overview

This board fits the specifications for what you need to REPLACE your motherboard with. You may not be able to purchase this board locally.Personally i think the upgrade option makes the most sense at this point considering the cheapo components listed we did'nt know about earlier...