If you see Grub loading, wait for an Error 21 error on your computer. You should check out these repair methods.
Approved: Fortect
The selected hard drive does not exist. This error appears when the hard drive is not recognized by this BIOS in the system.
For some reason my computer freezes and when I restart I get this error (Grub Internet Streaming Stage 1.5 is loading Grub, wait for error 21) and I can’t get back to Windows. The only way to safely start Windows is to force a reboot.
I definitely had Ubuntu on my machine, and when I googled stuff like this, I had no luck…
Edit: I have Windows 7 and tried a fresh clean install anyway and got lucky. Has been working for over a year. but it’s rare that I don’t deal with a problem, but now I’m finally tired of some nonsense.
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When people turn on your computer, you may find that your computer freezes with grub boot error 15, 17, 21, or 22. How can I fix this so that my computer works normally again? This MiniTool blog will show you the answers.
Advice. If you find that BOOTMGR is missing, you most likely refer to this article to fix the problem: 11 Solutions for BOOTMGR ErrorMissing on Windows 10/8/7; If you are interested in NTLDR missing problem, you can read this article to get solutions: Ten Solutions to Fix NTLDR Missing in Windows 10/8/7.
LOOK! Here’s how to recover data effectively when PC won’t boot, and exactly what to do when PC won’t boot.
How To Fix GRUB Boot Errors?
- How to fix GRUB 15 boot error?
- How to fix GRUB 17 boot error?
- How to fix GRUB boot error 21/22?
Do you know how to recover data from a damaged or even scratched CD/DVD? Now read this article and get a third party tool to complete the following task easily and efficiently.
GRUB boot error always occurs when you start your computer or laptop. This can be caused by incorrect GRUB configuration, incorrect GRUS location, missing GRUB, corrupted MBR, etc.
There are different types of GRUB boot errors, such as GRUB boot error 15, error 17, 21, and 22. This updated article will show related products. You can scroll up to savehurt them.
I installed Linux on a flash drive because I got an error after starting my computer:
From what I’ve read, this means that I can’t fully boot Windows without a flash drive connected just because my Windows got corrupted when I installed the GRUB Stage 1 mbr. In any case, a good explanation of this mess should definitely be read here (start with the next paragraph). The MBR can be easily fixed with my windows recovery disk, I don’t suffer from this but I found the best simple solution that worked great for me. Fortect is the world's most popular and effective PC repair tool. It is trusted by millions of people to keep their systems running fast, smooth, and error-free. With its simple user interface and powerful scanning engine, Fortect quickly finds and fixes a broad range of Windows problems - from system instability and security issues to memory management and performance bottlenecks. My default system is Windows XP Media Edition Station with a 200 GB SATA hard drive. Well that was the idea, I decided to replace it with an 80gb SATA hard drive because I needed more space for both approaches (but I didn’t know how to use that drive. The 80gb sata drive must be installed as a slave. so I just take out the pin directly and install without the pin)Grub Loading Phase 1.5 Grub Loading, Please Wait….. Error 21
My computer is a Compaq Presario SR1750NX Approved: Fortect
Two years ago I installed Ubuntu Vista, and on a complex 40 GBI didn’t have any problems with it on the IDE drive, just the fact that I installed it as a corporate slave drive and it works great for me because I sometimes use it connected and disconnected when I wanted to. I would choose Ubuntu (obviously) or Vista, not Ubuntu Grub XP.
Note: this is never my food, I just took it straight from the internet. I would say
Windows XP Media Center Edition and
Vista (charger)
So there were no problems.
Three weeks ago I installed Vista and along with it Ubuntu 8.04 on an 80gb sata hard drive, everything is ok in the configurations so there was no problem when I turned on my computer, in this case the Ubuntu grub appeared everywhere 
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