CD-Rom tray does not open

I tried to attach 2 new cd-roms, so the cd-roms are ok. As mentioned, the tray does not eject, when I press the physical button nor when try to eject it with the explorer. the strange thing is, that the motherboard works for everthing else. Both IDE sockets working with my 2 harddisk but both sockets do not work for the cd-roms.

Actually I have already experienced a broken motherboard, and then it was not possible boot up the pc. is the maybe something on the motherboard, which is exclusively responsible for optical drive or so?

jumper are also setted properly and cd-rom is recognized in the bios. what else could be wrong??

If the drives work fine on other machines, you have narrowed it down to this machine.  The button works independently of the OS, so it isn't a software problem.  That leaves the cables, jumpers and IDE controller; you have already checked the jumpers and cables, so that leaves the motherboard.

this was also my first logical conclusion, but why it's only my cd-rom, which isn't working? (hope you understand that I really don't wanna replace my mb without being 100% sure)

Most problems with PCs will not get any more sure than this, especially if it involves the motherboard.  The process of elimination of other causes is thorough enough that I would say it is the motherboard with confidence, and there's no test for the motherboard to refine it any further than this.  You could take it to a repair shop and I am sure they will conclude the same thing; the only difference is that they will charge you a lot of money for the same words.

mprssjpr, that sounds very interesting and could really make sense (haven't thought about that possibility). However, the CD-Rom receives power from the support supply, so what could the be wrong with it?

yes... cd-rom is dected in in the bios as well in windows. so, if I just connect the CD-Rom to the power supply and the tray does not open, I could say the power supply is damaged?

>>   I could say the power supply is damaged?  <<  i would suppose 1 out of 2 : power supply, or cd drive. If the rest of your PC works, it clearly is NOT the power supply, but the cd drive.
A possible cause could be a bad power connector (try another) to the cd drive.

nobus, i already attached my 2 old cd-roms as well as 2 new cd-rom... this should be defintely enough to say that the cd-rom isn't a real concern.

but i am going to try that with the new power supply, just to make sure... this will take some time form my side. thanks for this thought, it gives me at least a little hope

if your disk drives run ok, use their power connector, and try the power connectors from the cd drives on the disks.
you can also swap the ide connectors : connect the disks to IDE1, and cd drives to IDE0