Am not the most IT minded, however have a laptop (Dell) and the battery is running down. Every time I connect the power lead, it tells me to connect a 9V adapter and does not charge, but kind of keeps the battery at its previous level. Said power lead has worked for over 12 months since it came with laptop, but now not. Noticed this once or twice before but just took power lead out, stuck it back in and it started charging. Does it sound like the adapter is knackered? Laptop clearly knows when a power lead is connected becuase it tells me its the wrong type! Cheers in advance.