cant load any OS after trying to dual boot windows 8.1 and ubuntu 14.04( self built)

i have installed 8.1 and wanted too install ubuntu 14.04.
the installition seemd to go all fine, but when i was booting up, nothing shows up. the grub dont even show up.
the screen is a bit orange for 2 seconds then it goes black, and the monitor says:no display dettected
i can boot up from USB and see the partisions in gparted.
thanks for all help!!
2 answers Last reply
More about load dual boot windows ubuntu built
  1. if you have windows 8.1/8/7 installation disc, boot into it, and select repair windows. Then select Startup repair. if it does not work use boot repair disk: (it is a bootable iso)
  2. thank you, the windows repair disc failed to fix it. the second of boot repair, it only fixed ubuntu ( I am gald at least I can use my latop) but it did not fix windows 8. do u have please any idea?
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