can someone help please, its urgent. i just bought a dvd/rw drive and when i try to install it, it says atapi incompatibel, what does it means. i just reconnect the wires from the original drive to the new drive. nothing seems to be wrong. i can only open and close it.

I found a similar problem on another forum so is not my solution , but you shoud try this:

"Restart in Safe Mode.
Goto your Device manager.
Delete ALL cd-rom drives that are present.
shut down the system, Unplug it from power and open the case.
First, check the jumpers carefully:
Hard drive should be set to Master.
CD-Rom drive should be set to Slave.
DO NOT USE CABLE SELECT!
There are only a few (Server) boards that use CableSelect.
There are also special cables needed for this.
Restart and check if it will be there again.

If not, Shut down again and unplug it from power.
Take the IDE cable from the CD-Rom drive.
If an extra IDE cable present, connect it to the Secondairy IDE on your Mainboard, Jumper your CD-Rom drive as Master (If that position is free afcourse!) and conect it to the second IDE cable.
Restart your system and see if it will do the trick.

"
"You are probably correct for older 40-wire cables: they have to be modified; I just never noticed it. 80-wire (40-pin) ATA/66/100/133) are apparently wired differently and accommodate C/S without modification. "

Make sure u've configured the jumper properly ....

Issue:

ATAPI incompatible press F1 to resume.

Additional Information:

See our ATAPI dictionary definition for additional information about this term and related terms.
AT Attachment Packet Interface (ATAPI) - An extension to EIDE which allows support for devices such as hard disk drives, CD-ROM drives or other computer peripherals.
Cause:

This issue can be caused by any off the below possibilities.

Cable loose or not connected.
CMOS values not properly set.
Solutions:

CABLE LOOSE OR NOT CONNECTED

If any hardware has been recently added or the computer has been recently moved it is possible that the IDE or power cables connected to the hard disk drive or the CD-ROM drive may have become loose or disconnected.

* When ever inside the computer ensure you are aware of ESD and it's potential risks.

Verify that the hard disk drive as well as the CD-ROM, CD-R or CD-RW drive have at least two or more cables connected to them. One cable should be a gray flat cable (data / IDE/EIDE cable) and the other should be the power cable. In addition, the gray flat cable should be connected to the motherboard or the interface card on your computer.

If the cables appear to be connected properly, disconnect the data and power cables and then reconnect them to ensure that they are not loose.

CMOS VALUES NOT PROPERLY SET

If all IDE/EIDE/ATAPI cables have been checked or disconnected and reconnected as instructed above and you continue to experience the same issue, it is possible that the IDE/EIDE/ATAPI device may not be setup properly in CMOS.

Verify that if your hard disk drive or CD-ROM drives are IDE/EIDE/ATAPI that they are setup in CMOS and setup properly to their configurations. If the hard drive or drives are setup as Auto, values do not need to be checked.

Additional help and information on CMOS can be found on our CMOS page.

BAD HARDWARE

If you have followed the above steps and continue to experience the same issues it is possible that your computer may have any of the following bad hardware devices:

IDE/EIDE/ATA Cables
Hard Drive
CD-ROM Drive
Motherboard / Interface card.