Old Acer Aspire - damaged hard drive - replaced with new - have XP installation disc - new external DVD - not seen in BIOS -

[brifd]

Old Acer Aspire - damaged hard drive - replaced with new - have XP installation disc - new external DVD - not seen in BIOS -

 

[webworkings]

That the DVD drive is new is probably your problem The computer doesn't have anything to recognize it yet. You may need to get the OS on a USB to get it to work.