What ohms are the ones you got? Don't
buy random cartos. Some Madvapes ones are 2.0 ohm and that is too low for a slim ecig (and the protection circuit of the battery may have disabled power). And their 2.5 ohm L-Rider ones - the ohms are fine but the first one I tried was great and I left a good review, then the second one was sheer garbage and I have been unable to get them to remove my good review and I am p'd off at them. Some random cartos may also be non-standard - not have the slotted center post or have a shorter threaded end and not electrically connect.
If you want good cartos,
buy the SmokelessImage Volt or Bloogplanet cartos (the same I think) or the Vapor4Life WOW cartos (or their Coolcarts if you want cooler ones). I use Vapor4Life WOW cartos (with a plastic/delrin drip tip as a cool mouthpiece) on my Smokeless Image Volt (same thing as Bloog Maxxfusion). And if you like a cooler carto, the Boge KR808D-1 2.7ohm ones at Liberty-Flights might be worth trying (I bought a pack but haven't tried them yet)
BTW - if you have the OLD Bloog Fusion - that is not KR808D-1 (it's KR808D-2 aka E9 and you would need a D2 to D1 adapter from leCig.com to use KR808D-1 cartos)