computer refusing to boot saying select boot device

Hi,

The error may be related to the HDD of your PC so if you want to save your files which inside it you may need to connect the HDD into another PC to save them. But please do try these troubleshooting steps that may help.
- Do a load BIOS first and make sure that HDD is set as the first boot device.
- If these doesn't work do reset BIOS to default by pressing on F9 once.
- If all these will not work do also reseat the HDD from the laptop.
- It would be your HDD if all these will not work.