Pixelated screen on start up or after waking from sleep

[Samot1]

 

 

I recently had to get my hard drive replaced. 
Since then when turning on my PC it occasionally has a pixelated screen, or when I wake it from being idle the screen will be pixelated or a blank white screen. 
This can be overcome by turning the PC off and on again. 
Occasionally the screen will flicker between a pixelated screen and the home screen. 
Any help would be greatly appreciated.

thanks 

[WAWood]

@Samot1 

You said you had the hard drive replaced, and since this is an All-in-One, I am going to presume that there is no drive access panel that can be easily opened, right?  That means someone had to open the case to get to the drive.  That basically voided any warranty in place.

My guess, since I don't have access to the PC, is that in the process, the screen connector cable(s) got pinched or damaged, or during reassembly, the same cable(s) did not get seated properly.  Either or both of these would result in intermittent display problems.

Even if you ran hardware diagnostics, that would not necessarily detect, nor would it fix, an intermittent problem.  You would need to get the PC examined by someone who can tell if anything got damaged or if the cable(s) are not seated properly.

There is nothing we can do for you about this from here, sorry.

[apishion]

Exact same screen for me.  Happens after cold start up after not having used the notebook for a while.  Sometimes get this goofy screen after display comes back after sleep mode.

I tested via HDMI to external monitor (see pic.)  IMO, if this were a problem with gfx drivers or GPU hardware, the same pixelated image would be replicated to the external device.

My guess is that this is a problem with the cable between mobo and display, OR with some component of the the screen assembly itself.  In my case, this is a new LCD touchscreen that I replaced myself.  Of course the part supplier swears that he tests all LCDs before sending them out.  Yeah, okay there guy. 

You have an all-in-one, so not quite as easy hooking up an external display to test with, is it?