My Compaq Presario 1800 stopped powering on at all except for a rattling noise on the floppy that happens the same with power supply OR battery.
After a full disassembly, I get this same rattling
(that sounds very much like "motor boating" as it is commonly referred to in electronics) when I connect the motherboard with just the tiny PCB that holds the power-on button & other Compaq buttons.
Does anyone now of such a problem?
Basically, I would like to make sure that such a noise is indeeded abnormal in my test configuration (motherboard with just the buttons PCB plugged).
I intend to try to debug the power supply (faulty capacitor) and if that fails, maybe buy a spare motherboard.
Any comment is welcome.
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Disconnect all cables from the computer. Press and hold down the power button for about 20 seconds. Reconnect only the power cable and try to turn on the computer on pressing the power button If it turns on then good otherwise, switch the power cable of the computer with the power cable of the monitor as they are the same cable as the power cable could be bad but this rarely happens. Open the computer and see if you see any light on the motherboard, if you do then the power supply is bad. If you dont then both power supply and the motherboard could be bad.
Just because the light is on doesnt mean it has engough power to start all the components... Try opening the computer and unpluging the things you dont need to start the pc. ie cd rom drives, pci cards floppy drives, ect. If it boots than it is deff the power supply if not it may be either the power supply or motherborad or cpu!
Sounds like the power supply or motherboard is biting the dust. U may consider power off, open case and clean out the dirt, check U'r connections and if the power supply smells, replace it.
Else replace the pc. When the power supply dies, it usually stresses the motherboard out and it dies later, sooner.
If the power adapter is working fine and tried in another laptop, then the most likely cause is the connector in the laptop is damaged or come loose on the motherboard and will need soldering to secure the connections.
If the power supply is faulty it could be the output power lead is broken inside the cable usually near to the round plug at the end of the wire so would need replacing, but beware some power supplies are made not to come apart, and be careful. You might just as well buy a new power supply if you don't know what your doing.
If the power supply is fine and the laptop shows some sign of life then the most likely causes are the cpu is blown, or the mothebard has blown, you could try taking out the cdrom and floppy drives because if one of them is faulty it could prevent powe rup.
Here is a Compaq document will walk you thorough a fairly lengthy procedure that should solve your problem. Here is the link: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&lc=en&cc=us&dlc=en&product=431080&query=presario%20sr1220&dest_page=product#N561
Let us know how this turns out or if you need any additional assistance.
It seems all Compaq laptops are infected by this problem.
If you are sure that the AC port and the AC adapter is working?
Can you hear the laptop trying to boot? ..e.g. Hard Drive spinning up, Floppy Disk Drive noise, etc.. if so ...Try hooking up a external monitor..
Does it smell like anything has burnt? (Call for service)
Is there anything that sounds loose when you shake it? (Call for service or you can to open it?)
Try booting your laptop from a bootable floppy if you have one. Or use Compaq's Recovery CD. But I doubt if you use recovery CD, you might lose data on your HDD. Which O.S. are you using?
The Boot-up mechanism checks all the hardware before starting Windows. Some times floppy drive doesn't allow the laptop to boot further by either not responding or sending wrong signal.