Your motherboard supports sata 1.5 gig. What is your DVD drive? This is an older board and may not support the newer 3.0 or 6.0 gig DVD drive. What you can try is make sure your cables are pluged in right and set the bios to boot first from the DVD or you can get an IDE DVD drive and set it to slave.
I copied and pasted the spec for your motherboard above
The DVD drive is an ASUS DRW-24B1ST. How do I check the gigs on that DVD drive? The cables are plugged in right. I already tried booting first from the DVD drive. Didn't work, it goes straight to booting from hard drive.
If the drive is not showing in the bios then you won't be able to set it up to boot first. I went to Newegg.com and Asus.com and looked up this drive but all it says is it is a sata drive so i don't know what it is either. This is a cd/dvd burner is all I could find. This drive may be dead. I still think you would be better off with an IDE drive with this old of a motherboard. This would be up to you.
Sorry I couldn't help. I have 2 dvd drives 1 is an IDE and the other is Sata and 2 IDE hard drives and 1 sata hard drive and never ran into a problem like this. I think the IDE DVD will be your best bet with the older motherboard....Have you tried this drive in another computer to see if it shows up in the bios?