The first problem you are having is due to the fact that the Intel(R) Core(TM) 2 Duo E4500 processor is not supported on the Intel(R) Desktop Board D945GCNL. You can confirm that here:
In regards to the second problem, please be aware that it is always necessary when switching motherboards to install the operating system on a freshly formatted hard disk drive. In some cases the operating system retains certain configuration settings from the previous board, which can cause conflicts.
i found motherboard D945GCNL is working with 3.4 GHz pentium 4 processor, and E4500 2.2GHZ core 2 duo processor is working with other motherboard,(D965, mercury).
Can anyone tell where is the problem?
2. Mean while motherboard (D945gcnl) replace with New motherboard DG41CN and use my existing setup, With this setup I am not able to boot the system. after POST cursor is blinking on the screen.
after disabling the core multithreading future in BIOS it boots up.
where is the problem?
Further to what Jose wrote, if the above means you're using the 3.4 GHz Pentium 4 CPU in the DG41CN, then that's also not a supported combination. http://processormatch.intel.com/CompDB/SearchResult.aspx?BoardName=DG41CN (nor is an E4500, for some strange reason, according to that page).
as per processor compatibility chart E4500 core 2 duo processor is not compatible with D945GCNL motherboard, but this combination I was using from last three years and it was working fine.
In another way if you search mating motherboard for E4500 Core 2 Duo processor then processor match shows that Found 0 Compatible Board(s) for Processor "E4500" how it is possible.
if you search mating motherboard for E4500 Core 2 Duo processor then processor match shows that Found 0 Compatible Board(s) for Processor "E4500" how it is possible.
Intel made a processor that's not compatible with any motherboards (in which case I hope you got a phenomenal discount when you bought it)
.... or.... do you think they may have failed to include that CPU in their compatibility engine for some reason and it's a mistake? Thanks for that
Maybe Jose can arrange for the web based CPU compatibility engine to be fixed?
As far as your problem is concerned though, the suggestion of a fresh install is spot on. There's only so much that plug and play can compensate for with a new and different board and this could explain the problem. If you really need to keep valuable data which you haven't already backed up, maybe you can put the HDD in another PC as a secondary drive and copy it all off that drive before swapping it back and perfoming a clean, fresh install.