Laptop error while starting (check cable connection)

The firmware is attempting to boot. To do that it needs to find some device to boot from.

It will check first the disk or disks, but in the end will fall back to searching the network for a server that contains the boot media. This network boot is called PXE boot.

It is probable that your disk has failed, and also likely that your data was lost. The disk can no longer be recognized as a hard disk.

Try first to open up the computer and search for a loose connection. Press on all connectors relating to the disk.

Second, if you have another disk, try to replace it. You will need to install the operating system from scratch. If this doesn't work, it's possible that the motherboard has failed. You might need help from a repair-shop.