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Windows 7: Lap top won't boot up error 15 GRUB4DOS red screen

22 Jan 2015   #21
Microsoft MVP


Grub writes boot code which is only cleared by wiping the hard drive with Diskpart Clean Command - formatting or merely deleting partitions is not enough.

In GRUB1 just the mere presence of this could ruin Win7 boot until it was wiped, something we dealt with here almost daily for years. Then suddenly GRUB2 was released and problems that severe have become rare - about as often as problems with Windows boot code interering in such a way they require wiping the HD.

My System SpecsSystem Spec
22 Jan 2015   #22

W7 Ultimate SP1, LM18.3 MATE, W10 Home, #All 64 bit

My issue was due to me swapping HDDs in and out of my system without adjusting the boot order in the BIOS.

The old hdd that used to have my operating systems on it, kept being detected first and that would trigger GRUB-Rescue.

I would never have found out about this if I hadn't been playing around.
My System SpecsSystem Spec
23 Jan 2015   #23

x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem

Quote   Quote: Originally Posted by lehnerus2000 View Post
I've seen something similar myself (during the past week).

I rebuilt my system last month and I re-purposed the old OS drive for data (i.e. deleted all partitions and then Quick Formatted the entire drive as NTFS).
Whilst I was playing around with another HDD, I discovered that the old OS drive still contained GRUB-Rescue, which kept popping up at inconvenient times.
This and the other posts re Grub rescue disk location, is very good information - thanks, now I know.
My System SpecsSystem Spec


 Lap top won't boot up error 15 GRUB4DOS red screen

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