That’s a good set of instructions; apart from this I want you to do something else too, just as a type of analysis.
* Check if the network booting options is enabled in BIOS if yes, disable it.
* Try tracing any issue with hard disk controller in device manager. There is an unavoidable possibility of it getting disturbed and starting to run under PIO mode. Perform the following actions on it:
- Uninstall the hard disk controller.
- Reboot the system
- let it install the driver again
- Reboot the system again
Sometimes, the issue is all because of hard disk’s attempt to establish a connection which delays all other tasks as it is queued among all other tasks. To verify this, you can check if the Hard Disk activity light remains lit for long.
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