By not powering up i'd assume that: there is
no led
no drive activity
no fan ( if the Mega 2 has a fan?)
also useful.
a monitor or tv ( although not nesscercary? )
and a working power lead!
Possible option is to stick a known autobooting or bootsector booting disk in and see if it starts loading.
If there is any power!!!
My Mega 4 currently powers up but does nothing!
fan starts, no screen, no drive activity! Current suggestion to me is to change my power supply!
