DVD-Rom no longer reading DVDs

It is possible that the drive is simply on its last legs.

Are the DVD's you are trying burned or retail(store bought) movies?

The reason i ask, is there are different DVD types. Mainly Single and Dual Layer(there are also R and RW, but lets just skip that for now). I know my old pioneer stopped reading Dual Layer Dvd's but was still able to read single layer(It was no longer able to read through the first layer to to that portion of the system being dead. Its much harder to explain how that works).

I also have a bluray combo drive that will read bluray but not DVD's.

This is simply because the bluray drive has 2 drives in one. so the bluray section(has its own optics and laser) still works, but the DVD/CD sides has died.

By cleaned a bit did you clean the DVD drive laser lens?

If you open the drive a qtip with rubbing alcohol(Isopropyl 70-90% higher better) can be used to clean the lens.

Be very gentile.

In most cases it is just dust and even a lens cleaner(cd with little fine hair bristles on it) will work.