|What disk were you trying to read? |
E.g. a DVD-rom capable drive may not be able to read some newer types of DVD disks, such as double layer ones.
Does the drive recognize other disks?
When did the old optical drive stop working?
It's common for them to malfunction after they have been used a lot for years, but if that doesn't apply, that's not common at all.
Had you dropped the laptop or subjected it to some other physical jar, or had you spilled liquid on it or exposed it to liquid such as rain ? Those things are the most common reasons a laptop gets damaged such that major parts such as the mboard need to be replaced.
Your ATX mboard is always powered in some places, even when the computer is not running, as long as the main battery and/or AC adapter are connected to it.
Did you remove the main battery and the AC adapter's connection when you unplugged the old drive and plugged in the new one ?
- remove the main battery and the AC adapter's connection,
unplug the new drive, plug it back in, restore power.