What do you mean by the keyboard light is blinking?
Also try removing all the memory sticks from the system then try turn it on, if you get different results i would say put 1 stick at a time, and try to narrow it down to see if its the stick or the slot.
If you get the same results as you have been getting, remove all other device, hard drive, and optical drive. if issues continues you may be looking at a bad motherboard.
Vostro 1000 Service manual :
ftp://ftp.dell.com/Manuals/all-products/esuprt_laptop/esuprt_vostro_notebook/vostro-1000_Service%20Manual_en-us.pdf
There is the manual just incase you need assistance how to remove any of the components.
Hope this helps Tarnue!