I have a small HP tower that after a bit of backing up and Upgrading the OS, finally went along to seeing what was wrong with the tower itself. It originally had appeared to be a power supply issue, however, once I replaced the power, and used one of a similar wattage, I found it where the fans for the power supply spun just perfectly, but the cpu and fan coolers didn't; at least not for long. I found it where the Fans would spin once the Power cord was connected, but the CPU and tower fans would shut off once I had pressed the Power button to turn on the computer, turning off before any image could boot onto the screen. I had theorized that it maybe something on the board, but it seems like everything should be wired up to snuff. Especially the Power Jumpers. Otherwise, the Ram should be alright, so I'm Not exactly sure the Issue here, can anyone help?

Did you replace the PSU?

Then the fans should work as before.

HP servers tend to do a full fan on (PWM models) and then will slow. Since it is controlled by motherboard, I'd think it is to blame. Could maybe connect fans directly to psu and maybe speed controller to get by with .

I don't think the fans actually stop. They probably slow down.

You don't mention what the model type of the HP tower is which would be pretty helpful.
Do you mean that you didn't use the correct HP part? Most of the HP server kit, rackmount and tower that I used to maintain had hot swappable fans. They were monitored by the motherboard and a failure would be flagged up. As some were redundant, you could lose one or two before the system decided it had had enough and shut down. The PSU was an integral part of the system so you need to have the correct one fitted - most of which, latterly, were redundant slot-in-jobs.

The old ML370 G4 systems, Yup, I'm going back a bit, used to complain with replacement fans not working so the only solution we had was to replace the system board.

Play Bonny!

Exactly the same behaviour I get myself.

I have an old Hp-Compaq desktop, from 2004 (the year HP bought Compaq out, so in fact I have genuine Compaq hardware - hooray!)

At power-on, the fans come on full-tilt; this persists until the BIOS has run through the quick RAM check, then slows right down to a crawl. In fact, tick-over is so quiet you have to peer through the side grille with a torch to make sure the CPU fan is still running. (Which it always is...)

This is running a K8 dual-core X2 Athlon64, still with the original huge hunk of aluminium for a cooler. If it breaks the 40C mark, I know it's working hard.)

Mine used to have a generic 'silver-box' PSU, putting out around 260W.....when new. A couple of years ago, I checked power draw with a multimeter, to discover (to my dismay) that it was barely putting out 200W. It got replaced with a 500W CoolerMaster B50 single-rail.....giving me much more peace of mind. (I don't use a GPU; the original onboard ATI Radeon Xpress 200 chip, part of the SB400 southbridge, still gives a remarkably sharp, crystal-clear display.....and for what I do (mainly still photo manipulation and graphic design work), is more than 'up to the job'.)


Mike.

I have an old HP xw8200 dual Xeon Netburst workstation. When it powers on the fans are running full blast, like an aircraft engine! Then, when the BIOS loads, the fans quiet down.