Cisnet pc model ca-bd901

why new PSU,? if PC dead before say so we fix that. ask.
slimlines use a custom HP PSU, not standard ATX.
the PSU on these also have HP custom fan controls from PC mobo
to the PSU, and will fail using any generic ATX psu.
IT NEEDS TO BE HP ONLY PSU, correct HP P/N#
NO PSU LABEL POSTED BY YOU
NOR THE SOURCE, NOR IF A USED PSU.
and both DC power wires, 24 and 4 pin must be connected or the CPU will be dead. 2 key power cords one goes near CPU,see?
some PSU have 120./240ac switch on the rear, and must not ever be set wrong, and is frankly step #1 OOBE. it..

If you unplug the power cord from the wall and the PSU, then flick the little red voltage switch on the back up and then back down again, plug it back in and it should work again

what tower? model, the monitor has nothing to do with power and dead fans in the tower.
'Sounds, (and silent to) means the PLUS in the PC is dead.
all things can be repaired, that is what technicians do.
here is the chain of events, ! to get noise (fans)
power in the wall 120vac , usa
power to the PSU,
the power button goes to the MOBO, and standby power is there
now and pushing said button the MOBO commands the PSU on
if the PSU is happy (PWROK) thinks PSU IS safe the PSU tells the PC its ok, and power stays up.
and fans run.

so my guess bad PSU, its easy to test with anyf $10 voltmeter,
ask.

tower PSU, 101

http://pcdied.com/power.html

Alarm? Try this, Unplug the computer from the AC, wait a few mins. and plug into AC, try to boot normally. You didn't supply the Model of the computer or the OS you are using. It may be a PSU? Unplug from AC, Try to reseat the Memory Mods, remove the CMOS battery and reinstall. Maybe this will help: http://www.medion.com/gb/service/start/

Could be a dead PSU, mother board or CPU to me.

First check the power source, are all connections good and switches on.

Assuming so, are there any led's lit anywhere on the tower when you turn it on or any fans turning other than the PSU fan.

If there are no fans, including the PSU, then the PSU has failed, if there are fans and led's lit then turn it off, remove power source, remove the cover and check whether the PSU is properly connected to the mother board properly (Large multi-pin plug) if it is connected properly,

After this, you need proper test equipment.

I would recommend checking the hood switch. Raise the hood and lock on the left or right strut tower area. You should see a small switch with a rod that sticks up.try disconnecting the switch and see if the problem goes away.If not you have an interior sensor on the headliner under a trim cover. The cover is clipped on.pull the cover down and try disconnecting the sensor to see if it fixes it.

sounds to me like a failing psu, you may need to test it with a psu tester if you have one available, if not any local pc repair shop should have one

If you need further help, reach me via phone at https://www.6ya.com/expert/joel_63c670a84e9f6a97

Open the computer and check the cable that comes from the power switch and goes to the front panel header on the motherboard. Make sure it is connected. If it is, you need to check if the switch is working. Two ways: check resistence at the end where it connects to the motherboard with it disconnected and turn switch on and off. If you don't have a ohm meter, you can also short the two pins that the power switch cable connects to. If it still doesn't power up, then it can be three things. The memory, or the cpu, or the motherboard. Swap each one at time until you determine what is causing the problem.

I'd say power supply first.

If you have an expansion slot filled with a video card, remove the video card (provided you have onboard video connector as well) then try to reboot. I just went through similar issues with an GForce video card, it went bad, but the machine appeared to boot althugh I couldn't see the screen. Removed the card & it came up using minimal VGA drivers provide with WinXP.

Obviously you cannot check the video driver if you're not booting up...and seeing the screen.

Find a buddy with a regular monitor and hook it up and try to boot. Dell monitors sometimes require their propietary drivers, so write down the model when you take your pc to a friend's place, and DL the driver and install it (provided you got it to boot up)

Brad

The alarm is a BIOS alarm. It is warning you of either a cooling fan failure or the processor getting too hot. Either way, you need to fix the problem, not just ignore it!

I would check that all the fans are running correctly and would also recommend that you give the insides of your computer case a clean out - you'll be amazed at how much dust can build up in there! This may well cure the problem.

If it is a processor temperature alarm, rather than turning it off, you may want to adjust it so it doesn't sound until a higher temp. is reached. You can adjust this from the BIOS screen, but I would check the maximum temp. that your processor is designed to run at before doing so.

To get to the BIOS screen to turn it off, press the delete key (repeatedly) while the machine is booting.

I can't tell you exactly when to find it in the BIOS, as this can vary from one computer to the next. Just navigate you way around until you find the relevant section.

**** WARNING ****

Changing settings in the BIOS can affect the computers performance, prevent it from starting, or even cause permanent damage to hardware. Unless you know exactly what you're doing, I wouldn't recommend changing things!

Hope this helps,

Matt