Hdd not recognised when i boot up my laptop

put your windows cd in the drive then hit any key to start,that is what it says

Make sure you have all your data backed up
Also make sure you have your re installation disk and proper cd keys to perform a clean install.

power your unit - press F9 for boot options - insert your 7 disk into cd rom and choose boot from CD-ROM. Follow instructions provided from install disk.

You probably need to replace the BIOS battery. This battery is small and on the inside of the laptop connected to the motherboard. It stores the BIOS settings, date and time. If this battery becomes worn out then it will cause your issue. First try and press F1. Navigate to the last tab and select to restore defaults, then save and exit. If the computer boots up fine but the next time you use it the same message appears then you need a new BIOS battery. Alternatively your HDD may be damaged if it cannot find a boot device. Check your HDD is recognised on the boot menu by pressing F12, select it and press enter and your OS should boot. Hope this helps,
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I had a Toshy A25, not with that issue, but I did erase Malware infected Vista from an Acer Aspire. The system is locked to boot from the HDD, so it needs an OS, I formatted an easy swappable Windows 98 OS onto the HDD. I was told Linux will work too. Get the BIOS settings to allow boot from the system's own CD/DVD drive! That is key to new installs, and getting the drivers loaded like they should

Microsoft will not activate windows if installed on another machine and moved.

fixboot c:\
fdisk /mbr

If possible try changing your cd rom or dvd rom for cd use check it is recognised in bios and change bios to boot from it,if you still get the black screen with flashing cursor ,could be os is missing due to hdd failure

i think you need to re-install your Operating System again since you got a new HDD wich is tottaly empty i assume so try to install your OS on the new HDD

let me know if it helped
greetings