Today i started up my computer and it had this message for me at the grub screeen.

GRUB stage1.5 loading...
error 18

I restarted it and it just said the top line, then hung
Then when i left it for a minute it came back with error 25.
. I read the troubleshooting manual on this, but i have been using this computer for a year now and it nevver had this problem. can anyone shed light on what could cause this?

edit: restartwd one more time and it worked. still, i would like this not to happen again and would like to find the problem.

edit again: Now this is urgent. It kept saying error 18 and wouldnt let me in every time after that. now i tried aagin one more time it says error 16. i really need the data off this disk so this is urgent now.I get errors like this because my motherboard is faulty.

Here is a list of what the errors mean
http://www.gnu.org/software/grub/manual/html_node/Stage2-errors.html#Stage2-errors

Error 25 sounds like faulty disk drive (or in my case IDE bus), and error 18 sounds like a random error caused by the same.

I keep powering my system off and on until it boots properly and it does, but I suggest you take a backup ASAP. I'm currently looking for a new mobo as its starting to get tedious.funnily enough, this is exactly what i am doing. i am taking backups, burning my MUSIC to dvds and such. But are you sure that it's the motherboard? I mean, my motherboard is a cheap one but i expect it would have more of a life than one year. I am not saying your problem is the motherboard. As I said it could be the IDE/SATA cables or the HDD too.

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Error 25 sounds like faulty disk drive (or in my case IDE bus), and error 18 sounds like a random error caused by the same.