Hmm, well first thing to change is to make the CD rom run from IDE2 and not IDE1 where the hard drive is, then make the hard drive IDE1 so its on its own from the CD drive.
Then try pushing cables in fully, taking them out if necessary and pushing them back in on the motherboard.
Now if that doesn't do it, then reset the bios chip to test that.
All you have to do is take out the circular battery on the motherboard for about an hour to clear the memory.
Also check your motherboard manual if it contains something called a 'CMOS MEMORY CLEARING HEADER' or something like that (Will wipe faster than just removing the battery)
If you have, then find this jumper object on the motherboard and switch it to another position, leave it for a few minutes, and then put it back.
Hopefully these ideas will work. I hope this helps