bootmgr is missing

Power down then hold the shift-control-option-power button. This should reset the SMC and allow you to boot back into Mac OS. Once you're booted, you need to use bootcamp assistant again. Make sure you read the entire boot camp assistant articles and follow them correctly.

A couple of things to try:

1) Hold the option key at the startup chime and select your Macintosh HD to startup with

or

2) Boot into recovery (hold command-R at the chime) and check your Macintosh HD for errors. While still in recovery, select it as the startup drive. You can do that from the apple menu button.

Hi all aparenttly i have an issue with installing windows on my iMac ... before a year ago i was able to install windows on my imac from a DVD but now my DVD-ROM from my iMAC cannot read CD-DVD's anymore ... ok so ive said lets install it from a USB

So after trying over 5 diferent DVD's to install windows non off them work some off them booted and even got in the windows install menu but with no result upon trying to copy files .....so here i must understand the BOOTMGR from the DVD works...

1 Step was enabling Boot Camp to make "Create a Windows Install Disk"

-and googleing the interenet and here o the forum i was able to do that ...after editing info.plist

2 Step using a USB stick boocamp made the USB INSTALL DISK

- the USB stick is THIS sandisk-sd4201-8gb-cruzer-main.jpg

- after searching o google again seeing some tutotrials aparenttly USB that have their own program inside dont work the rest will work as said .

3 Step boot from USB i needed rEFIt to install on mac ... wich i did and aparenttly worked ...

- after i installing all trying to boot ...from stick

scenarios ....

1 Boot usb from rEFIt selected windows at first sais ... BOOTMGR MISSING press CTRL+ALT+DEL

2 Boot usb from rEFIt selected WININSTALL ..... BOOTMGR MISSING press CTRL+ALT+DEL

3 Boot usb from rEFIt selected the STICK ..... bootmgr UNSUPORTED

4 Boot usb from BOOTCAMP by holding alt on keyboard ...still getting BOOTMGR MISSING press CTRL+ALT+DEL but on other video on youtube if i insert the usb on the back i should have the MAC > WINDOWS > USB on the boot menu llike this guy but i dont aparrentlly bootcamp does not recognize my usb installer

ok i said maybe the en_windows_8_1_pro_vl_x64_dvd the bootmgr is damaged lets try something else

installed on my laptop RMprepUsb made from the DVD DISK a usb installer disk with FAT 32 Format and same issue BOOTMGR MISSING press CTRL+ALT+DEL or bootmgr unsuperted 😐 BUT .... the USB BOOTs on my LAPTOP so it works but does not want to work on my iMac why ?

ANY SUGGESTIONS WHAT CAN I DO ? ive tested 5 DVD's didnt work 2 diferent ISO to make USB bootable ....and failed does sandisk-sd4201-8gb is compatible on iMac ? or what sould i do but a new usb stick please help

Sorry, I thought you had a notebook. On an iMac shutdown and pull the power cord. Wait 30s, plug it backin, wait 5s, then restart

You might want to consider starting a new discussion. Since this one is marked solved, less people are likely to look at it. You can link to this one.