Ubuntu的引导区出毛病了

今天早晨起来开机进不去系统了老提示:

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CRUB loading...
Error 18: Selected cylinder exceeds maximum supported by BIOS

试了n次突然进去了,我到网上查了以下原因

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This error is returned when a read is attempted at a linear block address beyond the end of the BIOS translated area. This generally happens if your disk is larger than the BIOS can handle (512MB for (E)IDE disks on older machines or larger than 8GB on others.). In more practical terms this means the BIOS is unable to start executing the kernel because the kernel is not located within the block it can access at boot up time.

This can be circumvented by creating a boot partition at the beginning of the disk that is completely within the first 1023 cylinders of the harddrive. This partition will contain the kernel.

The kernel itself does not suffer from the same limitations as the BIOS so after the BIOS has loaded the kernel the kernel will have no problem accessing the whole harddrive. Newer BIOSes will automatically translate the harddrives size in a way that it can be completely contained within the first 1023 cylinders and hence modern computers do not suffer from this problem.
The same error can happen when the BIOS detects a disk in a different way as Linux does. This can happen when changing motherboards or when moving a GRUB-bootable disk from one computer to another. If this happens, just boot with a GRUB floppy, read the C/H/S numbers from the existing partition table and manually edit the BIOS numbers to match. If using a SUSE linux and installing on VM Ware this problem is solved by creating a small partition at the very beginning of the harddisc, and mounting it as /boot.

但我的电脑是新电脑,以前一直行的,不会突然由Newer BIOSes退化成老版本的bios了吧,
升级bios,估计不是个可行的方法吧.
第二种可能的原因.我也没换主板,也不是把硬盘放到别的机器用系统.也不可能是这个问题吧.
也不知道啥原因,快考试了,也没时间折腾这玩意.