- “No bootable device – insert boot disk and press any key”
- “No Boot Device Found. Press any key to reboot the machine”
- “Boot Device Not Found. Please install an operating system on your hard disk. Hard Disk (3FO)”
- “No boot device is available”
The most common reasons for 3F0 error to occur is:
- Using the unbootable device or disk to boot from.
- If the bootable hard drive you are using might have corrupted or damaged somehow.
- MBR or boot sector is damaged on the bootable hard drive.
- If your system has gone through a virus or malware attack.
- The wrong boot order in the BIOS.
- Hard disk connection problem.
- System files or boot files unknowingly damaged.
- Corrupt hard drive partitions.
1: Change Boot Order
2: Perform a Hard Reset
Performing hard reset can often solve issues, to perform a hard reset do the following:
- Turn off the computer and unplug the power adapter. If there is a removable battery, it should also be removed.
- Then disconnect all peripherals, including the removable hard drive, etc.
- Press and hold the power button for 15 seconds to drain all remaining power.
- Insert the battery, and then re-plug the AC adapter into the laptop.
- Press the power button to turn on the computer.
- Once the computer starts up properly and the startup menu appears, use the arrow keys to select “Start Windows normally” and then press Enter.
3: Test Hard Drive Using HP Diagnostic Tool
Use the built-in tool in the Hp device to solve the issue:
- Turn on your computer and keep pressing the Esc key until the menu appears on the screen.
- Next, press the F2 key.
- Choose the Components Tests option from the HP PC Hardware Diagnostics menu.
- Select Hard Drive from the Component Tests menu.
- Click on the Quick Test, then click on the Run once button.
- If there are still any issues with your hard drive, then run the Extensive Test.
4: Restore BIOS Default Settings
- Press the Power button to start the computer, and immediately after this, repeatedly press the F10 key to enter the BIOS setup menu.
- To load and restore BIOS Setup Default settings, press F9 on the BIOS setup menu.
- Once loaded, press F10 to Save and Exit.
- Select yes, and then press Enter when it says Exit Saving Changes.
5: Reconnect Your Hard Drive
- Turn the computer off and remove the power cable.
- If you have a removable battery, take it out
- Disconnect your hard drive and then connect it back.
- Reassemble your computer and turn the computer on to see if it fixed the issue.
6: Fix and Rebuild Damaged MBR
- Boot from the original installation DVD (or the recovery USB)
- At the Welcome screen, click Repair your computer.
- Choose Troubleshoot.
- Choose Command Prompt.
- When the Command Prompt loads, type the following commands: bootrec /FixMbr bootrec /FixBoot bootrec /ScanOs bootrec /RebuildBcd.
7: Fix Operating System
- Prepare a Windows installation disc, CD/DVD or USB flash drive and connect it to your PC.
- During the installation process, launch Command Prompt.
- In Windows 7, under the System Recovery Options tab, click Startup Repair.
- In Windows 8 and Windows 10, click Repair your computer, then select Troubleshoot > Advanced options > Automatic Repair (Windows 8) or Startup Repair (Windows 10).



The true cause is that there is no working Border Gateway Protocol (BGP) routes into Facebook's sites. BGP is the standardized exterior gateway protocol used to exchange routing and reachability information between the internet top-level autonomous systems (AS). Most people, indeed most network administrators, never need to deal with BGP.
Cloudflare VP Dane Knecht was the first to report the underlying BGP problem. This meant, as Kevin Beaumont, former Microsoft's Head of Security Operations Centre, tweeted,
"By not having BGP announcements for your DNS name servers, DNS falls apart = nobody can find you on the internet. Same with WhatsApp btw. Facebook has basically de-platformed themselves from their own platform."
Many people are very annoyed by this and with the fact that they cannot use their social media platforms but it seems that Facebook employees are in even bigger annoyance as it was reported that Facebook employees can't enter their buildings because their "smart" badges and doors were also disabled by this network failure. If true, Facebook's people literally can't enter the building to fix things.
Reddit user u/ramenporn, who claimed to be a Facebook employee working on bringing the social network back from the dead, reported, before he deleted his account and his messages:
"DNS for FB services has been affected and this is likely a symptom of the actual issue, and that's that BGP peering with Facebook peering routers has gone down, very likely due to a configuration change that went into effect shortly before the outages happened (started roughly 1540 UTC). There are people now trying to gain access to the peering routers to implement fixes, but the people with physical access is separate from the people with knowledge of how to actually authenticate to the systems and people who know what to actually do, so there is now a logistical challenge with getting all that knowledge unified. Part of this is also due to lower staffing in data centers due to pandemic measures."
Ramenporn also stated that it wasn't an attack, but a mistaken configuration change made via a web interface.
Both BGP and DNS are down, the "connection to the outside world is down, remote access to those tools don't exist anymore, so the emergency procedure is to gain physical access to the peering routers and do all the configuration locally."
Technicians on site don't know how to do that and senior network administrators aren't on site.
It seems that it will all be down for a couple of more hours before the issue is resolved. 