This could still be a power supply issue. You can buy a power supply tester. This will tell you if the power supply is putting out power to all of the cables.
The other cause of this issue could be a motherboard issue. HP would have to replace the motherboard. A lot of the time HP make their mother boards to fit only their cases. This makes it hard to place a non HP board into a HP case.
SOURCE: Dell Dimension 8300 flashing amber power light and dead pc
it seems *********** board is having problem plz send it for servicing
SOURCE: hp pavillion desktop will not
Step 1 : Turn off the system by pressing the power button for 5 - 10 sec until the power LED is off. Removed all cables including the power cable (Exclude monitor cable and KeyBoard/Mouse).
Step 2 : Press power button for 5-10 sec again to drain fela power.
Step 3 : Reconnect the power cable at the back of the tower/computer and power on the system.
**If the same problem exists, Call HP tech Support (800-474-6836) because there is a high possibility that you have a bad Motherboard or Power Supply on the system.
SOURCE: hp pavillion power problem
Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure:
CAUTION: This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.
1. Disconnect all cables from the computer, including the power cord.
2. With the power cord disconnected , press the power button on the front of the computer for five seconds.
Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
NOTE: If the power supply fan makes an inconsistent grinding sound or stops and starts erratically, replace the power supply.
3. With the power cord removed, flip the red voltage selector switch to the opposite position. Wait about five seconds, and then switch the red voltage selector switch back to its original location. Ensure that the voltage selector switch is on the correct setting, 115V for North America.
Performing this step ensures that the voltage switch is engaged and set correctly for your country/region.
4. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet and test to see if the computer can turn on.
SOURCE: AMBER LIGHT ON?
can you try this? unplug the pc, hold down the power switch until the amber light goes off, then (with the pc still unplugged) push the power button to see if the amber light comes back on, if it does, repeat the first step. do this until no light comes on when the power button is pushed. after you've done this. plug the pc back up, then hit the power button. what happens?
ive had this happen to a lot of my dell pc's here at work, but all i can figure out is that its a mobo problem, i also have tried swapping PSU's, but it didnt help.
SOURCE: Dell Dimension 5150 will not boot. Flashes amber light
I had the same issue with my Dell Dimension 5150 and I replaced the front I/O USB Audio Panel and it booted right up.
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