[ubuntu] Ubuntu Install CD's not being read.

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http://ubuntuforums.org – Ok, here is an unusual problem. I have a Dell vostro 1510 with an nVidia 8400M graphics card. The GPU fried on it and I had it sent into dell. They probably replaced the motherboard and flashed the BIOS with an updated version that corrects the GPU error. Now, when I received the laptop today I tried to clean install Ubuntu 9.10 on it. The CD will either not launch or have a very long hang time on a blank screen and not continue, or will launch into the live disc and the install will not go past 5% formatting. I managed to get it installed by removing the HD and placing it in another computer, installing 9.10 with the same install disc then placing it back in my laptop. DVDs can be placed on the laptop in the operating system. However, any of the Live CDs from any version will not launch upon boot. However, the Dell Windows XP cd will run fine from boot. Any ideas? (Hardware)