My 12-year old Laptop power supply was replaced several years ago with an unbranded 19.5V / 4.74A from Ebay with 5.5mm/2.5mm barrel jack.
The PC works fine with this PSU.
Now that I have my smart Rigol DS1054Z I see horrible interference which disappears if I run the Laptop off its battery.
If I buy a used HP 19.5V/4.74A will this cure my problem?
Or can anyone recommend a suitable PSU? Preferably new.
Or should I just buy a new Laptop? (this one was Vista-32. currently Win7-32)