I have a Precision M6700 without a CPU or GPU.

I installed a Intel I7-3630qm and try to get it running. Does not seem to work. The processor works fine on a Toshiba laptop from which it came.

When I power on there is nothing in the display - he screen is blank, so is any external VGA monitor.But the power button light is on and stays on. No other beeps or lights.

I did BIST and the screen seems to be good  - I get alternating RBGWB color screens without any lines etc. (As described inhttp://www.dell.com/support/article/us/en/19/sln153653/how-to-troubleshoot-a-dell-notebook-lcd-panel-issue?lang=en )

1.  What are all the Intel I7 processors supported on M6700?

Prefer quad core, but I can settle for 22nm (or below) dual core/4 threads cpus also.

2. The installed CPU has integrated graphics. Why do I need an add-on GPU (MXM 3.0, I suppose) then?

I also removed and reseated the cmos battery to ensure the BIOS has the defaults assuming that doing so will default to CPU graphics capability.

Any help is greatly appreciated.

I do not do much of graphics work, need lot of cpu cycles and memory.

Thanks