PC Hardware forum

General discussion

Help HP M7330n PSU Replacement

by mustbuypc / February 28, 2009 10:18 PM PST

I have looked over and over for help with connections from the power supply unit to my HP M7330n and cannot find any specifics. I'm wondering if anyone still owns this PC and would be willing to post here or gmail with me the exact power connections for this PC.

I thought I had everything connected properly but I'm not getting any picture at all.

Any help would be very much appreciated but I'm looking for info pertaining specifically to this PC and not necessarily on PSUs. The HP website is incomplete with their support as has been their chat support.

Thanks again.

Discussion is locked
You are posting a reply to: Help HP M7330n PSU Replacement
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: Help HP M7330n PSU Replacement
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.
Collapse -
Recheck and verify
by Willy / March 1, 2009 12:59 AM PST

If you reconnected all the connections, then you may have a bad PSU period, it has failed. You didn't give any info as to results other than no display, are you saying, the system seems to want to boot. Are there beeps or some sign of booting life. As for connections they are straight-forward and shouldn't be that confusing. You may have extra connections as to power for other devices, etc.. Just what connect appear to left unhooked or what type are they, can you place some pics of them on a public display, like "bit bucket" or similar picture sharing source? Since, there so many systems out there, even if not HP, that in itself isn't going to hurt to know. HP follows the same convention on PSUs as every other maker out there. You're best bet is to find a PSU replacement and see what details they may provide. On your PSU, find the decal/sticker and note down it numbers, etc. and look for replacement to include a higher wattage one as well, yours is probably at least 200W or better.

PSU: http://www.sparepartswarehouse.com/HP,Computer,Power-Supply.aspx

Also, you didn't offer why you're doing this in the 1st place, what got you there. If that's possible, post.

tada -----Willy Happy

Collapse -
Recheck and verify
by mustbuypc / March 1, 2009 2:48 PM PST
In reply to: Recheck and verify

"what got you there?"

The PSU that came with the machine died.

I bought a 400 watt PSU although the original was 300 watt but I couldn't find a 300 watt one in a retail store.

The system definitely wants to book, I mean it sounds normal but no picture.

There is one beeping noise I get if I connect a small, square 4 headed connector directly to a slot on the motherboard. It repeats every 3-5 seconds, one medium long beep. When I remove the connection it goes away but either way, I'm not gettinng a picture.

I'll see if I can get spmoe Pics but thanks for the help.

Collapse -
Getting somewhere...
by Willy / March 1, 2009 11:54 PM PST
In reply to: Recheck and verify

Now, the beep sequence is telling you something. The system can't boot due to an error condition.
link: http://www.computerhope.com/beep.htm

It depends on the brand and version of the bios you have to determine the real nature of the beep code. However, as the video is not displayed suggests that the video port is bad or faulty. In other words, when the PSU went, it caused a 2ndary problem. Or that problem was the cause of why the PSU went. Since this is a HP system, a on-board video port is made. If that is the cause, your best bet is to use a 2nd video card(PCI or PCI-e) probably pci type to get beyond the use of the on-board video. However, you need(maybe not) to disable in the bios that video port's use. Though, in newer system that's a "auto-setting" feature and should default to new video port(card).

You lessen the demand for power by disconnecting all int. devices like the drives. If possible, you could get a "display" even if a error one to see and disable the current video port in bios, set it and save upon exiting the bios. If that's done, shutdown system. Install new video card and try to reboot with devices connected or not. You are troubleshooting this, it may get to point if you have a display, that the problems are now mtrbd. related, thus a bad mtrbd. Afterall, the PSU causes 2nary issues. The 4-connection plug is the video one and the system needs it installed. Of course, I hope its the right connection. I would think HP offers the connection points to users via the manual. If no manual(in hand) try the HP support website and d/l one for your model#.

tada -----Willy Happy

Collapse -
(NT) Are you using the 'onboard GPU' or a separate video card ?
by VAPCMD / March 2, 2009 12:34 AM PST
Collapse -
PSU and Video Card
by mustbuypc / March 2, 2009 12:52 AM PST

Thanks to both previous responses...

I purchased a video card to replace the integrated GPU. I am fairly certain it is a PCI Express card.

I thought it might be part of the problem so I removed it and tried connecting with the onboard gpu and had the same problem - beeping and no beeping (without video cable plugged in) and no picture.

I have tried a number of times to bring up the bios but yep, with no picture, no success. Will try removing some of the power connections to the drives and see if that helps. Otherwise, I'm close to the point of getting back to my username for this forum.

Collapse -
Does the PCI video card require power from the PSU...does it
by VAPCMD / March 2, 2009 2:43 AM PST
In reply to: PSU and Video Card

have a power connector on it ?

If yes...I'd reinstall it (the PCIe card) and make sure the connector from the PSU is connected to the GPU. Worth a try.


Collapse -
I suggest...
by Willy / March 2, 2009 12:33 PM PST
In reply to: PSU and Video Card

With power-OFF, remove the new video card. Connect plug to on-board video connection. Now find the CMOS clearing pins, short them or remove battery for 5min., then return. Be sure all int. drives are disconnected. Now apply power, do you get any display at all? If not, power-OFF attach new video card and retry again. Leave video power plug at mtrbd. connection. As the other poster offered be sure that the new video card doesn't need a power connection itself, verify. If still no display, then you yet another issue or probably the mtrbd. has been done-in. As a last resort, reseat ram sticks or swap them around, reset firmly and fully, use ESD care.

tada -----Willy Happy

Collapse -
HP M7330N and power supply.
by mopscare42 / March 3, 2009 9:31 AM PST

I have that computer and changed the power supply about a year ago because of the my new graphics card requirements.
I installed a 500 watt Antec supply and just went connection for connection from old to new and didn't run into the problems you are having.
I would follow willy's advise as I had an older HP computer that when the power supply crapped out it took the motherboard with it. It acted like what are experiencing right down to the beep.
My graphics card is PCI express and is plug and play so I would assume yours is the same.

Collapse -
HP M7330N and power supply.
by mustbuypc / March 4, 2009 2:41 AM PST

great info - thanks. In some ways I'd like to buy a new one but I have a lot invested in this one.

Do you still own that computer? I'm trying to figure out where the portable media drive power connection is on the motherboard.

Thanks for your help.

Collapse -
I will check.
by mopscare42 / March 4, 2009 8:54 AM PST

Yes, I still have it and it's about due for a clean out so I will do that tonight and let you know.
When you say "Portable Media drive" do you mean the card reader top front of the computer?
If I remember right it is in the lower center of the MB and is a real pain to get to, but I will check in an hour or so.


Collapse -
Card Reader
by mopscare42 / March 4, 2009 10:00 AM PST
In reply to: I will check.

The card reader hookup to the motherboard is on connection JUSB2-1.
There are two hookups directly below the big ATI IXP 400 chip and it's the lower one.
My motherboard is a MSI board so if your computer has the ASUS board that could be different.
Hope that helps.


Collapse -
Personal Media Drive
by mustbuypc / March 5, 2009 1:36 AM PST
In reply to: Card Reader

Thanks a lot for looking at it.

Sorry - I meant what you can see on this page.


and this in particular is what I mean about middle of the page:


The media drive is housed in the bay in which the hard drive is mounted on. There is a white cable leading from that bay to...somewhere. It is a white cable with a square black head and five female pins. Maybe it doesn't connect to anything but not sure how the drive would work.

Collapse -
by mopscare42 / March 5, 2009 7:20 AM PST
In reply to: Personal Media Drive

I use a USB external hard drive so I didn't even know what that was called.
That hooks up on JUSB2-2, right on top of the card reader hookup.
There are two hookups very close together, that Media Drive is the one on top.


Collapse -
Help HP M7330n PSU Replacement
by mustbuypc / March 15, 2009 4:25 AM PDT
In reply to: Sorry.

Thanks to all of you for your help but sadly, save for a trip to a true PC repair specialist, I couldn't bring it back to working life.

It is great to know that people are still out there and willing to help with a question related to a pc thread that is nearly 4 years old.

I may come back soon for help on a video card on the new Dell I purchased.

Thanks again!

Popular Forums
Computer Newbies 10,686 discussions
Computer Help 54,365 discussions
Laptops 21,181 discussions
Networking & Wireless 16,313 discussions
Phones 17,137 discussions
Security 31,287 discussions
TVs & Home Theaters 22,101 discussions
Windows 7 8,164 discussions
Windows 10 2,657 discussions


Your favorite shows are back!

Don’t miss your dramas, sitcoms and reality shows. Find out when and where they’re airing!