Windows 10: Compaq Presario 5660 Desktop Not displaying anything on monitor

One day I turned on my computer and the computer turned on but instead the normal boot screen with the Compaq logo and black background had these red and white blocks started appearing in the top left corner one by one. I made a recreation in MS Paint: After the screen went away nothing appeared so I turned off the computer and plugged in another monitor and Windows 98 booted up Either in normal mode or safe mode, I don't remember and I saw that it booted up fine. So, then I powered it back off, and plugged in the original monitor. But when it turned on, nothing appeared on

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Compaq Presario CQ5504F Desktop $250.00

Staples has Compaq Presario CQ5504F Desktop (search 884370) for $250 with free shipping after entering code 66802.

What do you think about this configuration??

 

Compaq Presario PC

Hi PC community! I have the Compaq Presario sr5610f with a swapped Hp Compaq dx2450 Mi motherboard, and when I first booted up the Pc it said,

NVIDIA Boot Agent 249.0542

Copyright (C) 2001-2005 NVIDIA Corporation

Copyright (C) 1997-2000 Intel Corporation

PXE-E61: Media test failure, check cable

PXE-MOF: Exiting NVIDIA Boot Agent.

When I reset the Pc and ran Diagnostics. The CPU, The Memory, The Hard Drive, And CD/DVD all passed and when it came to testing the Boot Path I got the message,

Error Code : BIOHD-3

Warning : No bootable drives detected.

Suggestion : Please contact HP support

Press any key to continue.

What should I do?

 

upgrading graphics in a Compaq Presario SR5450F

I'm not sure how to post all of this, but here is a link : CNET: Product reviews, advice, how-tos and the latest news