Advanced Metallurgy would be necessary to build a steam engine, because the boiler has to be strong enough to hold the pressure in, and this is not possible without very strong steel or originally wrought iron, which is relatively difficult to make without impurities that make it useless.
https://en.wikipedia.org/wiki/Wrought_iron
The Vikings would be interested in advanced metallurgy if you showed them a stronger sword, more unbreakable than their swords. Then you could progress to engines, and suchlike.
In fact, making better axes, then building a set of rails from the place where trees are cut down to where the ships are built and making a horse drawn cart that can go on the rails might be a possible way of gaining their good will, because it will significantly speed up the process of ship building.
By working this way, i.e. creating something that meets a need, you could change history and bring on the industrial revolution much earlier and the present would be completely different. Perhaps the Vikings would end up ruling Europe and from then on everything would be completely different.
You could bring a solar charger for your laptop, of course. If you were there between 950 and 1250 AD there would probably be enough sunlight because this was the Medieval Warm period, when temperatures were warm enough in Europe to make Greenland (now virtually a chunk of ice) more habitable. 308
After this of course was the Little Ice Age, when the inhabitants of this part of the world suffered a climate induced famine and came down in their ships to raid the unfortunate people of Cornwall etc.
https://en.wikipedia.org/wiki/Medieval_Warm_Period
Of course if they had steam power in those days, the Little Ice Age may well not have been so disastrous for the people living in Greenland, as they would have been able to travel more easily and import coal from Germany, and heat their villages. Alternatively they may well have been far more effective at raiding Europe.
Either way, everything today would be different.
Question: are your Vikings Christians or Pagans? Or is this happening in a period when both are intermingling?
Because on beholding your laptop, a tablet on which magic writing appears and tells you things you couldn't possibly know yourself, the Christian Vikings may well react with a different variety of superstition. They might think you are a devil, and might well try to kill you - think Beowulf which is an Anglo Saxon tale about a Christian <PERSON> killing a devilish monster in Denmark.
https://en.wikipedia.org/wiki/Beowulf
The Pagan Vikings might think you are one of the Norse gods - specifically <PERSON>, or <PERSON>, the messenger of the gods, (a natural assumption considering your magic tablet on which writing appears in a strange tongue) or <PERSON> perhaps (depends on how big your beard is - if you have one and are male! If you are female I'm not sure which Norse goddess they would think you are.
Note also that in general in the early history of this interaction some Christian Scandinavians considered the Norse gods/idols to be inhabited by devils or demonic powers, while essentially being powerless against <PERSON>, later on, the legends about the gods etc were thought to be worthy of being recorded by Christian monks etc because they were seen as simply legends, interesting stories that people might like.
A further thought - it took an awful lot to make the Christian Danes and Geats in the tale of <PERSON> react hostilely - the Danes asked the Geats to help because <PERSON> was murdering them indiscriminately in extremely violent attacks. Quite often throughout history Christians were welcoming to rather strange manifestations - such as the <PERSON> children of Woolpit (or Wolfpit).
https://en.wikipedia.org/wiki/Green_children_of_Woolpit
So what I'm saying here is - they may well have been welcoming and hospitable. I think it depends on whether they are fundamentally friendly people or not. Could be either - you get both types in any culture. 72