Since no error messages I take it the CDs never boot (USB too.) Many CD drives lose the boot capability as they age and we all know the Windows can get damaged and not boot but that's not a hardware issue.
When I see your story I know to pull out the shop USB DVDRW drive and try a boot from that. Some tinkering may be needed in the BIOS to do that which I won't cover here.
My guess is the machine is over a year old and needs at least a new DVDRW drive.
HP compaq nx9420 refuses booting.?
XP professional centrino duo 2 ghz and 1gb ram.Cannot boot in windows I tried linux it won`t boot, cannot boot in safe mode. Pulled hard drive connected another one, the same thing happens. Can only get to bios memory tester in bios showed test pass, won`t boot cds or usbs, so I can`t reinstall windows or format the disk, I`m out of ideas, any help?