Solved Compaq Presario 5214X Powe Supply Changeout

April 22, 2015 at 19:08:41
Specs: Windows 7, Pentium
I changed out old Bestec ATX 250 12Z power supply with a new one (same brand). The computer runs but it does not seem to boot up since there is no signal to the monitor. I think I may have wired the power supply with some shortcomings. Is there a way to get a picture of connections from the power supply to various devices such as the motherboard, fans, etc. I was not cautious enough to write down where all the cables went or did not take a picture disconnecting the old power supply. Thanks in advance.

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✔ Best Answer
April 24, 2015 at 06:14:46
"I paid $39 on Amazon"

You paid too much for a garbage power supply & I still question why you didn't get one with 24-pin main ATX plug? But what's done is done.

You really cannot hook it up wrong. The plugs & sockets are designed in such a way as they cannot be connected incorrectly. The 20-pin main ATX plug goes to the 20-pin socket (24-pin in your case) & 4-pin ATX12V plug goes to the 4-pin ATX12V socket...that's it for the motherboard. The other plugs are for hard drives, optical drives, floppy drives, etc. Extras are provided in case you want to add additional drives. There are almost always unused plugs that need to be tucked away.

Are you hearing any beeps when you attempt to boot the system? A single short beep means "all is well". No beeps or multiple beeps indicates a problem. You do NOT need any drives connected to boot the board. To troubleshoot, unplug everything except the 20-pin & 4-pin plugs to the board. Unplug all external devices from the tower except for the monitor & keyboard. Then try to boot & see if the HP/Compaq splash screen is displayed. If it is, try to access the BIOS using the keyboard.



#1
April 22, 2015 at 22:20:16
First if the new power supply has a 115/230 voltage switch make sure it's in the correct position. DON'T GUESS and if you change it do so only with the power cable disconnected.

All you need to fire up the motherboard is the 20 or 24 wire main connection, the cpu fan and, if required, the 4-wire ATX connector. The drives don't need to be connected to get an image on the monitor.

Bestec are generally considered to be lousy power supplies. If your previous one failed it's possible it ruined your motherboard as well. So a new PSU might make the fans and drives spin up, thus making you think everything was OK, but the motherboard would still be bad.


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#2
April 23, 2015 at 09:08:35
Thanks for your suggestion. The old power supply had the blinking light and the computer would not start. After reading posts on HP support site, I used the hair dryer procedure(very strange) to make the old power supply working again and the computer working again as well. But if you powered off the computer, you would have to go through this procedure again. That was the reason I decided to replace the power supply. The motherboard has 24 pin connection while the power supply has a 20 pin connector.

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#3
April 23, 2015 at 14:10:52
Here's your system specs & motherboard specs:

http://h20564.www2.hp.com/hpsc/doc/...

http://h20564.www2.hp.com/hpsc/doc/...

"I changed out old Bestec ATX 250 12Z power supply with a new one (same brand)...The motherboard has 24 pin connection while the power supply has a 20 pin connector"

As DAVEINCAPS said, "Bestec are generally considered to be lousy power supplies". You would have been better off getting a reliable name brand unit such as a Corsair 430W. It goes on sale regularly for about $20-25 after rebate. How much did you pay for the Bestec?

http://www.newegg.com/Product/Produ...

Why would you get a 20-pin PSU if you knew the board has a 24-pin socket? The 20-pin should work as along as you don't install a video card. The additional 4-pins provide power for the PCI-e slot. The board also requires a 4-pin ATX12V plug to power the CPU. The socket can be seen in the link above, it's slightly lower & to the left of the CPU socket. Make sure you have it connected.


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#4
April 23, 2015 at 14:27:37
The Bestec replacement power supply is the same model as what in the computer. Same 20 pin configuration. I paid $39 on Amazon. I appreciae your help.

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#5
April 23, 2015 at 20:49:17
I was not able to figure out by looking at the diagrams in the links provided. I will try to attach a picture of opened computer showing which cables I have connected and which cables are left dangling.

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#6
April 24, 2015 at 06:14:46
✔ Best Answer
"I paid $39 on Amazon"

You paid too much for a garbage power supply & I still question why you didn't get one with 24-pin main ATX plug? But what's done is done.

You really cannot hook it up wrong. The plugs & sockets are designed in such a way as they cannot be connected incorrectly. The 20-pin main ATX plug goes to the 20-pin socket (24-pin in your case) & 4-pin ATX12V plug goes to the 4-pin ATX12V socket...that's it for the motherboard. The other plugs are for hard drives, optical drives, floppy drives, etc. Extras are provided in case you want to add additional drives. There are almost always unused plugs that need to be tucked away.

Are you hearing any beeps when you attempt to boot the system? A single short beep means "all is well". No beeps or multiple beeps indicates a problem. You do NOT need any drives connected to boot the board. To troubleshoot, unplug everything except the 20-pin & 4-pin plugs to the board. Unplug all external devices from the tower except for the monitor & keyboard. Then try to boot & see if the HP/Compaq splash screen is displayed. If it is, try to access the BIOS using the keyboard.


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