Intel chipset mother board

[fmvps2]

I have P4 2.66Ghz processor. The intel original board 945 is died. Which intel chipset board will be compatible. My usage is continuous running of computer for around 16 hrs a day.

 

[Avro Arrow]

You won't find one new. Maybe you'll find one on eBay but it will be too expensive. If a P4 2.66GHz was sufficient, then you can replace it all for about $132:
CPU: AMD Sempron 145 Sargas 2.8GHz - $39
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103888
Motherboard: Foxconn A88GMX AM3 (With Radeon HD 4250) - $50
http://www.newegg.com/Product/Product.aspx?Item=N82E16813186206
RAM: G.SKILL 4GB (2 x 2GB) DDR3-1333 - $43
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231253

That's about the same price you'll pay for just an old motherboard for that CPU, this stuff is all-new and it will completely outperform the system you had, with superior graphics to boot.