希望符合你的要求：
Friend : Hi, what are you doing ?
Me : There is something wrong with my computer, so i just try to fix it.
Friend : Is there anything that i can help you ?
Me : Sure, if you are convenient, thank you.
Friend : Let me have a try.
Me: Ok.
Friend : Oh, i know what's the problem now, just a minute, i can fix it.
Me: Really ? It's cool.
Friend: It's ok now. You can restart your computer again, hope it will work fine this time.
Me : Wow, you are so great, it did work now. Thank you so much.
Friend: It's my pleasure.