upgrade from hdd to ssd- unable to boot Windows7 from cloned ssd

I've been trying to upgrade my HP pavilion dv6 3100 CTO laptop, running on windows7 64 bit, from HDD to SSD. I tried to use Samsung SSD 850 EVO. I used Macrium to clone the ssd and the cloning went well. The disk manager shows both the disks - the old HDD as well as the newly cloned SSD (connected by USB to SATA cable), as Disk 0 and disk 1, respectively, and all looks good and identical.

After I installed the new SSD in the Disk bay, the windows start, but then after the login screen, the screen shows message, "Preparing your desktop". And after spinning for a long while gives me a blank blue screen with an active cursor. That's about it.

Before cloning and installing the ssd, I had done some research, but got no definite answer to solve my problem. The bios (latest version f.29- sp55299, from Insyde H20) does not allow entry into the set up at boot stage. So no matter what, there is NO option to switch from SATA to AHCI mode in the BIOS.

I did all the exercise going through regedit to modify Msahci and IastorV to 0 values, as explained in these forums, while still using the original Hitachi HDD. After that I cloned the HDD to the Samsung SSD and physically installed the SSD in the laptop.

my computer has the Intel Rapid Storage Technology (RST) installed and the System info there shows:- "Intel AHCI Controller: Intel(R) 5 Series 4 Port SATA AHCI Controller."

Where as the Device manager still shows : "IDE ATA/ATAPI Controllers: Intel(R) 5Series 4 Port SATA AHCI Controller".

After pouring over dozens of pages in this forum and several others, I do not have a definitive diagnosis or solution to my problem. I am Not sure if my Computer is now on AHCI mode. I don't know why my laptop still have just a blue screen and not move on to the Desktop. I desperately want to upgrade it to SSD for speed. Right now its painfully slow.

Could you please help???