Having problems with your Compaq D51S 1.6GHz Desktop XP Computer ?

Why does my computer swith on but not boot up

\015 And with no response to pc moniter screen,my desktop ps is a compaq pentium 4,EVO 51S,when i switch on the start button the fan srarts up and the motherboard starts up with the internal usualy green light staying red,the CD-ROM is working opening/shutting,i have tried using spare memory sticks to see if that was to do with it but made no change and anyway it is not bleeping,the biggest problem cure to help would be if the moniter would come on i have tried 3 moniters but there is no response and does not power up this would help if onlt to give me bios/error problems without this im totaly confused the graphics card is inbedded so i have also tried self supported cards in graphics slot but still the screen is not responding also used boot up disc's this has failed to help either,please any prognoses or suggestion to solve this would be greatful and very welcome,im pretty good working on computer's but this one is baffling me,many thanks in advance,garnedd.\015

Answers :

Hi Garnedd!
\015\012
\015\012First of all, it sounds like you've taken a lot of troubleshooting steps thus far. So thank you for providing the details of those steps. It helps greatly.
\015\012
\015\012After what you've tried, there are very few major points of failure that come to mind.
\015\012
\015\012The processor is probably functioning correctly because you can force simple requests such as opening and closing the CD-ROM drive.
\015\012
\015\012You mentioned that you tried multiple graphics cards but none produced a display. The embedded graphics hardware might be damaged or faulty causing a complete failure of video; which might also be causing the graphics slot to fail. If that is the case, you will need to replace the motherboard.
\015\012
\015\012You also mentioned the motherboard LED is showing red versus green like it normally does. This could mean that the power supply is sending a "Power-bad" signal to the motherboard; which also means there might be a malfunction internal to the power supply.
\015\012
\015\012If you have a spare power supply, try testing the machine with that and if it works, you'll have located the source of the problem.
\015\012
\015\012If the problem persists, try unplugging the power cables from every non-critical, internal component (i.e. CD-ROM, Floppy drive, etc) but leave power cables plugged into the hard drive, fans, motherboard and video card (if applicable). Listen for the hard drive's spinning platters and the sound of the reader arms accessing data. If you can hear that noise, it's likely that the issue is related to the inability to export video.
\015\012
\015\012If you need information regarding the specifications for parts internal to the machine, a good place to look would be in the manual that came with the machine (if you still have it). You will be able to reference the manual to purchase replacement parts that match the hardware profile of the motherboard.
\015\012
\015\012If you have questions or require clarification, please reply and let me know.
\015\012
\015\012I hope this helps!
Try getting a new graphics card or when it turns on try resetting it a few times.
Repair Help & Product Troubleshooting for Compaq D51S 1.6GHz Desktop XP Computer

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