Hi,

Opened the case and checked for lint & dust inside and espescially around the CPU Cooler, Video Card and PSU fan.

If lint & dust found get a can of compressed air suilable for electrical appliances and blow it out of the fans & off the motherboard & vents. I also use a Vacuum cleaner with a non metal tool preferable with bristles on the end. Not touching components but sucking up the loosened lint & dust.

Run your computer & if it's works OK the replace the DVD drive.