We have no knowledge or idea here, these here are just some thoughts we have brainstormed.
the attached logos are many years old.
Though, the plus sign has some importance since its existed since 1998 and is for emergency aid, but for computers.
3d effect and or gradient colors might do a logo more modern?
however, stylish simple has its great charms too.
yet, the blue-white-only is too simple.
Colors: Darker Blue, white, black.
gold, grey and green are ok
the blue cross, the white one and the green examples are the oldest, selfmade variants.
in some old logos we have had a slogan translated to When you need a technician. since 1998 - "När du behöver en tekniker" and "sedan 1998". these are not in the mandatory list, but that 1998 if could give some extra secure feeling. one colleague wished for a mascot figure too, but that would be a bonus thing.
Some thoughts from the old owner:
I want to bring about, a stylish way for warmth, safety, easiness, highres, soft and easy to recognize.
Dark Blue or Green for Polish the Cross, maybe Aluminium or White for the borders. One color is too oldish.
At least have a plus/cross sign
Use at least a gradiancy between 2 or 3 colors/tones in the Cross sign and silver or white borders. – to give it more life and not look old.
soft, warm, happy
Or the Abstract Scenario,
Do feel free to be creative and think outside the box.
If you have an idea that is totally different, it just might be THE new spark.