If you have a boot CD , try getting your system to boot from CD (either set boot options from BIOS or use the function key (Normally F8 or F5) to give the boot choice option), and repair your system.
You may lose any emails you have.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.