New Replacement Video Card Questions & Prob. Description, Please

Hello,

Not too sharp with this, so please bear with me a bit.

Have a 3-1/2 year old HP Desktop PC running W7, the 64 bit version.

About 2 months ago, the PC would suddenly totally quit on me.
Using the utility SpeedFan, it seems that the small fan on the video board got gunked up and was
not turning. So, took the board out, cleaned the fan, and all was fine again.
Speedfan showed it working, as well as the two other case fans.

My conclusion is that the PC stopped due to an automatic thermal shutdown on my graphic board.

Has happened again.
Speedfan utility shows 0 rpm for fan on board.
But, I can see it turning quite well if I remove the PC case.
Speedfan is just not showing it for some reason.
a. Any thoughts on this; fan does seem to be working ?

b. I expect to buy a new PC as soon as W10 comes out, so really don't want to put much $
into this one. But if there is a cheap solution to get me to the Fall, would do it.

The board my PC is using now is: ATI Radeon, HD 4650 PCI Bus 1

I see that Amazon has some Radeon Sapphire boards for around 30 to 40 dollars.

Would any of these be an exact replacement ?
Not looking for matching the capabilities exactly with what I have now, which I think at the time of purchase was considered "a very good one".

Just the basic (video) capabilities to get me thru. Watching YouTube, some home videos, etc.

Have no idea what to get.

Would any of the (cheap) ones on Amazon "reasonably" do it ?
Not smart enough to re-configure anything; just want to drop in a new one, "and go"

Might you pick one out for me, perhaps ? Would be very appreciative.

What do you think of:
Sapphire Radeon HD 5450 1 GB DDR3 HDMI/DVI-I/VGA PCI-Express Graphics Card 100292DDR3L

Any caveats to just slipping in a new cheap one ?


Any and all thoughts on this would be most appreciated.


Thanks, really appreciate the help,

Bob