My DVD drive keeps opening on it's own lately. Completely at random, all on it's own. No eject HUD pops up on the screen either. When it opens, I have to manually close it by hand, as the eject key on my Apple keyboard wont close it. Only then will the key work again after I manually close the drive.

Is there any explanation for this or a way to fix it? I have no idea what could have caused it. I checked the internals, the cables, everything checks out fine. This also doesn't occur under Ubuntu.

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Mac OS X Leopard 10.5.8 (9L30) | Chameleon 2.0 RC3 | Intel Pentium 4 3Ghz 800Mhz FSB HyperThread 1MB L2 cache SSE3 1MB L2 cache works, cosmetic display of 512KB L2 cache | Asus P4V8X-MX VIA Chipset, VIA-VT8237 Southbridge | AC97 VIA8237 | Dual 1GB 333Mhz DDR SDRAM | nVidia PNY GeForce 7600GS 512MB 8x AGP DVI/TV-Out/VGA [NVinject 0.2.1; QE/CI/QuartzGL/Rotation] | Darwin Kernel Version 9.7.0: Sun Jun 14 20:48:28 IST 2009; Voodoo 2.0 Intel alpha3 :xnu-1228.12.14/BUILD/obj/RELEASE_I386 i386