Will the GA-P55A-UD4P and i860 work together

It should work straight out the box.

PS. What about the rest of your hardware? And "won't post", what do you mean? It won't even startup for a few seconds? We need more information to help you out.

Yes, the i7 860 works just fine with the GA-P55A-UD4P.

We have a sticky for troubleshooting boot problems. You need to perform EVERY step in the checklist and let us know how it goes. It solves the problem 90% of the time.

http://www.tomshardware.com/forum/261145-31-read-postin...

I'll even take a wild guess and say that specifically #2 on the checklist will solve the problem since that's by far the most common mistake.

Ok what I have is:
I-inc iH-252HPB 24.6in Wide 1920x1080 2ms LCD Mon
DDR3 MEM 2Gx2 so 4G / CRUC CT2KIT25664BA1339 R
DVD BURNER LG / GH24NS50
Ultra LSP750 750-Watt Power Supply - ATX, SATA-Ready, SLI-Ready, 135mm Fan
HD 1TB / HITACHI 7K 16M 0A38016
Antec Nine Hundred Two No PS Evolved Ultimate Gamer Case (Black)
GeForce GTX 285 OCFU 1024MB PCIe 2.0 Graphics Card core clock 712
Gigabyte GA-P55A-UD4P LGA 1156 P55 ATX Motherboard
Intel Core i7 860 Processor 2.80GHz

I am new to building PC’s, so not really knowing what to look for is some of the problem. I did read the http://www.tomshardware.com/forum/ [...] t-problems and the only thing I see here that I did not do was put in a case speaker. I am new and thought the mother board had that on it, didn’t know I had to get one. I have ordered one though but don’t see a place to put it on my mother board. The processor it running I see all the lights for it up it the right hand side of the mother board on. The video card gets warm. Just nothing comes up on the monitor. I’m starting to think this is my monitor not kicking on it just stays in sleep mode and says it has no video signal when I power it on. Your thoughts?

BTW….. The monitor does work, I been using it on my laptop. But I did notice today that it didn’t show anything on it till I got into the desktop.

"No video" problems are very common. In fact, that's why the sticky was created. If you're absolutely sure the CPU power connector is plugged in and both PCI-E connectors are plugged into the GPU then I would focus on steps 6 - 8 next to rule out the RAM as the problem. Putting the RAM in the wrong slots, not setting the RAM values correctly in the BIOS, or faulty RAM are all pretty common causes of "no video" problems.

Well it works now I powered it up and nothing come up on the screen. So I powered it off and back on and it worked. WTH....lol loading windows on it now.

Good to hear!