Okay, well as i told you before i am not an electrician so i don't know but a fried of mine is and he told me that ungrounded wall sockets can cause interference and can shorten life span Pc parts.
There is little more to it but my english is not that great to explain but i hope you will understand what i mean.
I am not an "electrician" either, but you can follow the link in my sig and see that I am an "electronics technician" and do have a pretty good understanding of how power affects electronics. Basically, electricians deliver power to buildings and wire the buildings to get power to the electronics. Electronics technicians troubleshoot, maintain and repair electronic devices like computers, TVs, control consoles, communications equipment, etc.
Your friend is absolutely right that interference issues
may result from poor or missing grounds. But not about shortening life spans. A missing ground to Earth
alone will not affect the expected life of any component. There would have to be other factors involved to shorten lifespans - like excessive heat, or excessive voltages or current (which cause excessive heat).
I know that Holland is the same (more or less) as the Netherlands. I've been to Amsterdam a couple times and also Rotterdam and The Hague. I just note that you have "The Neterlands" (with no "h") under your name in your profile so I could not be sure if that was an accepted alternative spelling for the Net
herlands, a misspelling, or a fictional place.
and it feels that my system is more responsive than with the other PSU but i am not sure yet.
Responsiveness is not really a function of the PSU. If the PSU works, the computer runs. If the PSU does not work, the computer does not run. If the PSU is not stable, the computer reboots or shuts down. It does not "respond" faster or slower, depending on the PSU. So your "feeling" that it more responsive is the placebo affect.
Three is no way to test this so lets hope for the best. The only way is to let an electrician come over and he has to redo all the wiring which the company i rent my apartment from will never approve for, so in my case there is little to nothing i can do to be certain what is going on. The only thing i can do is ask the company i rent my apartment from is to ground my wall sockets.
Not sure what you mean here. There are outlet testers for your type wall outlets. Or an electrician can test them. As far as repairs, yes, that would be up to the apartment owners. But if a certified electrician finds the outlet's wiring is unsafe and/or not up to code, I am sure there are laws and regulations in the Netherlands that require landlords fix them - and quickly too.
The only problem there that I see is your landlord getting mad at you and raising your rent or kicking you out. If your electrician friend is "certified/bonded" and will test your outlets for free, then great. Otherwise, I would get a tester (I recommend everyone have access to a tester anyway) and if it shows the outlets (check all in your apartment - especially those in the bathroom/WC and kitchen areas) are bad, then "nicely" inform the landlord. He certainly does not want all the bad attention a little kid getting electrocuted would bring down upon him!
If he does not correct them in a reasonable amount of time (you would have to decide what is reasonable), then he should be reported to your city's public safety/code enforcement people. And if the tester does show you have bad outlets, I recommend you let your neighbors borrow your tester and have them check their outlets too. There's power in numbers.