|"Kindly let me know, what you mean by specs"|
If it's an OEM computer (Acer, Dell, HP, etc), post the model & model number. If it's a custom build, post the make/model of the motherboard, CPU, RAM, HDD, power supply, etc.
"I also tried all the three boot options to boot from HDD only"
There should be a boot order in the BIOS. If you want to boot off a CD, he 1st boot device should be the CD drive, the 2nd device should be the HDD. If your system also has a floppy drive, the order should be floppy - CD - HDD.