Problems with GRUB

[emilie . habart]

Dear Mrs or Mr,

i have installed mandrake 7.1 and windows 98 on my compaq presario,
and GRUB is the bootloader. I work on these two systems with
no problems, but recently when i start my computer the
i haven't "Welcome to GRUB the operating system chooser ..."
but i have the prompt on GRUB: GRUB>

I don't understand what's happen because i haven't modified something
which can affect the starting of my computer. 
Do you know what happen's?
How can i find "Welcome to GRUB the operating system chooser ..." or
boot on linux?

Thank you in advance,

emilie Habart.

-- 
Emilie Habart

Institut d'Astrophysique Spatiale

Batiment 121, Universite Paris Sud, 91405 ORSAY Cedex, France.

Tel: 01.69.85.85.69 Fax: 01.69.85.86.75   

e-mail:address@hidden