The right fan/heat sink

no makers name told. ACer?or make COLORFUL.
post photo of this mobo or tell where you bought it , or what PC it was removed from or post link to where you see it for sale (OMG best)
first the pin count correct, 3 or 4 pins.
lost the heatsink too for CPU.
the right fan matches the heat sink first. not told. yours.
and fan diameter is next. not told by you in mm.
intel CPU , LGA 1155
my wild guess is standard Intel fan + heat sink assembly snap on fan base. to mobo ,no screws. the Acer BY SAME NAME ive no clue no ACER PC model told if is acer.
if is intel heat sink we can replace the fan, easy using diameter match and connetor 3 or 4 pin match, all are 12vdc or PDM (4p) modulated. up to 12v.

got this fan HS assembly or lost it all or was the fan part stolen?
here is my 1155 intel, the fan can not be removed or replaced
ever, only the whole things
so you you posted a photo of your, omg , make this so easy ?


go

50c is par.
at 90c the intel chip , (or amd) shuts it self down, all by itself.
so 80c is no good. its too near 90c. see?

my guess that is the Asus bios temp reporting, like mine does.

The CPU runs hot, some up to 100watts of heat, ever touch a 100watt light bulb? burns fingers, there you see what hot means.
the fan must blow well, yours seems to.
the correct matching heat sink ,matched to your heat rating of your unstated CPU is next, why not buy a max sized heatsink fan assembly and end this.? do not use 20w CPU fan-hs on 100w CPU. ever.
then use real heatsink compounds not that $1 junk sold on fleabay.(China cloned crapp, endless )
next is airflow in the PC case.
now photos by you of mobo in a case, or in toaster mom chucked.
haha..... but sure i cant see your PC, can I and matters , in the world of thermodynamics.
Air flow from, the front of the PC to the rear must happen!
case temps inside must be kept below 30c, so the Heat sink can even work at all.(and its fan)

this grease is best from JAPAN. no hype , it's commercial grade.

http://www.pcdied.com/Filth101/html/image_12.html

fanless design means no fan required heat sink will cool cpu

Try Best Buy they do have heatsink assembly. heatsink included. that would mean you have to replace the heatsink too.

This is a standard micro atx board. The holes you are seeing will be on any 478 mobo, you just have to remove the black bracket, which is usually achieved by lifting the center pin in each of the corners.

scan for virus, if it is not a virus change the power supply unit.

the problem is that the mother board you are now using has a 4th wire that sences cpu temp this allow the heat sink fan to change speed to get this to work correctly you will need to replace the fan with a 4 wire style. what is happening is your not getting a temp siginal back to motherboard so the fan controller think it hot and send full power to fan alll the time the stock fan in hp systems is not very good any way .Get a good heat sink and fan to fit your new board ebay has them very cheap 5.00 to 20.00 this will all so increase you system temp and all get the proper cooling when you really need it.

Have U checked the thermal paste under the heat sink and the graphic controller (integrated one)

That is the 'Northbridge' chip that provides the I/O interfacing for the main chip. The heat sink is normally held on with glue as you surmised, and should be re-done with a thermal conductive glue. The glue (a silver filled epoxy) is available from MCM electronics or from Mouser. Be sure to thoroughly clean the chip and heat sink before re-gluing.

you can contact online for techsupport at dell at www.support.dell.com this a live tech support session totally free they have helped me out numerous times keep me posted on how this goes ok best regards mike