Core i5 60C on low load, blocked laptop case screw

Hello. I bought a used HP Pavilion G6-2260sw. I have a problem with cpu temperature. I think it is way to high. At first I was getting temps between 40-50+ celsius. Nw after a week this seems to have increased by 10 degrees. I have 60C just by using browser with 1 youtube video playing in background. Is it acceptable? My desktop pc cpu has 60C on 100% load. I ran prime95 and laptop temperature on 100% load is 80C. I think the laptop is clean, haven't encountered any dust when I blew it with compressed air.

Maybe I should replace thermal paste, but I don't know if I'm able to take everything apart. I tried, but I encountered a problem, there's no screw in one hole, it's empty. I don't whether it was soldered to not open the case or it's design. Please have a look at this video :
My laptop doesn't have the screw at 3:08 Everything else looks the same. What do you think?

 

With a potent (enough) i5 IB platform, a discrete gpu and a HDD, that temp seems acceptable to me when running a .

Try blowing/clearing any dust and debris from the fan and the vents more carefully (take it apart as much as possible and use a Q-Tip and isopropyl alcohol ...) but reapplying TIM will only give you marginally better temps, imo, and even that, for a short time only...

What browser were you using? If it was chrome, firefox or the new MS Edge, they really suck down the power vs. good old IE 11...

You can't compare a notebook's cooling system to a desktop, btw. Crammed vs. effectively unlimited options (and noise levels) in the desktop.

The 80C at 100% load is an indication that everything is alright to me.

 

I'm using Chrome on Linux. On Windows temperatures were a bit better, but I haven't used it for last few days. Now I logged into Windows and temps were high just like on Linux. I have disabled discrete gpu as I don't need it, but I haven't noticed temperature improvements since then.
I can't access motherboard because of the screw problem. So I can only blow air at it.

 

80 degrees is well below unsafe temperatures for Ivy Bridge. The Tj is at 105 C, you're still 25 C below. As tiller said, this is entirely normal for a laptop CPU. Desktops run cooler simply because you have way more surface area and airflow for the cooler. That holds true for stock Intel coolers and even more so for aftermarket coolers.

 

Ok thanks. I won't bother with reapplying thermal paste then, but I still would like to access motherboard to clean it better. Manual says there are 9 screws that hold the top cover, I can only get 8. The last one just isn't there, there is just solid metal inside the hole.

 

Screw head may have broken off during assembly. Not much you can do about it then. Did you remove all 8 screws and it seems to still be attached there?

If it is really a broken screw head then you can try to solder the tip of a screwdriver to the post of the headless screw and turn it that way.

 

It doesn't look like broken screw. There is just no screw at all in the hole. I don't know if it's still attached, it won't come easily that I'm sure of. The top cover is pressed into the rest, it would take a significant amount of force for it to disengage and I won't try much force when I'm not sure if there's a blocking screw.