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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Remove the side panels on your desktop computer. The floppy drive will be attached to the drive bay with 4 screws (2 on each side of the floppy drive) or by a plastic slide clips. After removing the screws, remove the power cable and the data cable from the back of the floppy drive and then you can slide the floppy drive either to the back or the front of the drive bay to remove the floppy drive from the desktop case.
The noise you are hearing is due to the fan. The fan is used to cool the magnetron during cooking, and because this fan is not working the magnetron is overheating and the thermal protector is opening, killing power to the unit. All you need to fix this is a new fan blade. The fan blade(look for part #80) is slipping on the motor shaft ( the noise you are hearing).
i dont really say if your mboard will get a damaged..try to change your power plug..if it still not working, you have to open your laptop, so you can find or know if there's some thing wrong...maybe you should have to buy a new one instead of replacing it..coz, if some parts of the motherboard also have damaged, its very hard to fix.. the parts are very small and delicate to fix it..thanks..
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.