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Black screen with white underscore before BIOS


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#1 typicalalex1

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Posted 13 July 2016 - 03:40 AM

Hi.

 

I have a problem with my computer that started about a month ago. The computer hadn't been used for about a month.

 

Most of the time, probably 19 out of 20 boots, my screen displays a black screen with a white underscore in the top left hand corner before i get to the BIOS. This is before any manufacturer logos appear. It is the usual flashing underscore which has obviously frozen.

 

I have re-seated all hard drives, my graphics card, removed all cables from my PSU and plugged them all back in again. Problem still existed.

I then unplugged all hard drives and tried to boot and the same problem happened again which rules out HDD failure.

 

It's going to be a problem with the PSU, graphics card or motherboard but i don't know which.

Before i start replacing parts, does anyone have any ideas on what it could be?

 

 

Like i said, it doesn't happen with every boot. Once the computer is on, it works perfectly. Putting the computer to sleep rather than shutting down has been working for a while which is how I've still been able to use the PC.



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#2 usasma

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Posted 13 July 2016 - 07:50 AM

Start with these free hardware diagnostics:  http://www.carrona.org/hwdiag.html

 

But, once in Windows I'd like to see these 2 sets of reports:

1)  Please run this report collecting tool (even though you may not be reporting BSOD's) so we can provide a complete analysis:  http://omgdebugging.com/bsod-inspector/
When done a Notepad document will open with the name of the file and it's location.
By default it'll be a .zip file located on your Desktop
Simply upload the .zip file with your next post and we'll move on from there.
If it doesn't work for you, then please try this:  http://www.bleepingcomputer.com/forums/t/576314/blue-screen-of-death-bsod-posting-instructions-windows-10-81-8-7-vista/

2)  Please do the following:
- open Event Viewer (run eventvwr.msc from the "Run" dialog)
- expand the Custom Views category (left click on the > next to the words "Custom Views")
- right click on the "Administrative Events" heading
- select "Save all Events in Custom View as..."
- save the file as Admin.evtx
- zip up the file (right click on it, select "Send to", select "Compressed (zipped) folder")
- upload it with your next post (if it's too big, then upload it to a free file-hosting service and post a link here).

FYI - If we're looking for Event ID 41 errors (unexplained shutdowns), there's more info on that here:  http://support.microsoft.com/kb/2028504

While waiting for a reply, please monitor your temps with this free utility:  http://www.cpuid.com/softwares/hwmonitor.html

 
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able.

- John  (my website: http://www.carrona.org/ )**If you need a more detailed explanation, please ask for it. I have the Knack. **  If I haven't replied in 48 hours, please send me a message. My eye problems have recently increased and I'm having difficult reading posts. (23 Nov 2017)FYI - I am completely blind in the right eye and ~30% blind in the left eye.<p>If the eye problems get worse suddenly, I may not be able to respond.If that's the case and help is needed, please PM a staff member for assistance.




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