s5520sc not efi boot

[idata]

s5520sc not efi mode booting

efi optimized boot enable,

use Legacy bideo for efi os enable

not video output

[idata]

Are you planning on create a GTP partition on this one?

[idata]

Hello, Jinwoo,

Even when your board is end of interactive support (Intel no longer provides email, chat or phone support for this product), we will try to help you as much as we can with your situation.In order to better understand your issue, could you please provide us with the following details?*Do you get image while booting your system on legacy mode?*Was your board doing UEFI boot before? *Do you have Intel or third party PCIe devices attached to your system? If so, could you please provide us with the device's model or part number?*Could you please provide us with a screenshot of your UEFI boot BIOS settings?We will be looking forward to your reply.Regards,Fernando M.

[idata]

Hello, Jinwoo,

Even when your board is end of interactive support (Intel no longer provides email, chat or phone support for this product), we will try to help you as much as we can with your situation.In order to better understand your issue, could you please provide us with the following details?Are you using a USB Flash drive or an Internal DVD-ROM?If you are using a flash drive then please try by re-formatting it and make it bootable againNow if you are using an internal DVD - ROM can you please try with and external usb DVD- ROM?

[idata]

We are wondering if you need further assistance with this matter.