Dell PP29L Inspiron 1525 Laptop

soffcec
soffcec used Ask the Experts™
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When I turn on my laptop, only the fan and hard drive starts , but nothing else, no beeps and black screen. Is there possible to reset the BIOS before I accept that my motherboard is caput.
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Commented:
I had a similar issue. In my case the memory wasn't seated correctly.
Other that what Storm812 said, Try:
Take tha battery out, unplug the power cord, leave unplugged for 3 minutes. Plug just the power cord in, try turning it back on and see if it reboots.
soffcecManager

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Commented:
Tried all of above without luck. The battery is bad. I have tryed to remove it. The power button works fine, I can turn on and off with it, but there is no light onit or on any light.
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There are some laptops that have a safety feature so if the battery is bad it won't allow the system to turn on. So just for my clarification that you were able to remove the battery and keep it out?
soffcecManager

Author

Commented:
I was able to remove the battery and keep it out. But nothing changed.
With the older Dell's with the power off and battery out you would press and hold the power button down for 15-30 seconds to clear any error in the BIOS. Been a while since I was dell certified and don't know if that works on the newer Dell's or not.
Remove battery.
Disconnect AC power.
Press and hold power button for 5-10 seconds.
Lights should flash, possibly a fan might startup, then die.

Reconnect AC power.
Press power button.

Should boot OK now.
Top Expert 2013
Commented:
here my laptop troubleshooting guide :
- if no display - test with an external monitor
- test also with a known good battery !
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
- if NO remove all ram and reboot --> if NO beeps, mobo or cpu bad ; if it beeps, replace ram stick
-if you can access the bios battery, remove the battery, AC, and bios battery for a minute to reset the bios
or test it, it should read 3 V
*** you can test the disk on another pc, if you like !

for troubleshooting the display (LCD) problems :  http://www.lcdparts.net/howto/troubleshooting/troubleshootingLaptop.aspx      LCD troubleshooting
When you press your power button on your laptop and the LCD screen just stays black.  What is the problem?

Possible problem can be the on-board video chip or Video Card.

Possible problem can be the power inverter.

Possible problem can be the back light of the LCD screen.

Memory

Bad LCD Cable Connections


On-board VIDEO CHIP or Video Card BAD

First let's look at the possibility that your video chip on your motherboard is bad.  You can also have a separate video card instead of on-board video chip.

If you press the power button on your laptop and you just get a blank screen, then you need to do a couple of checks to see just what the problem might be.

1) If the LED lights are on and you hear the fan in the laptop running and hard drive working but there is no video, that usually means the video chip on the motherboard has gone bad.  This can be repaired by re-flowing the video chip. You will have to find a good repair tech that knows what he is doing for this repair.  It might cost in the neighborhood of $150.00 for this repair.

2) Plug a external monitor to the laptop and see if you have any video. If you see video on your external monitor then your video is OK.
NOTE:
When your power inverter is bad or the back light is bad, you can usually see a faint image on the LCD screen.


Power Inverter / Backlight BAD

1) If your video displays on the external monitor then your LCD screen has a problem.  Either your power inverter is bad or your LCD backlight has gone bad.

2) Check that your power inverter plug it seated properly. Without a tester to hook to the inverter or back light (CCFL) there is a general guideline you can use:
If this happen all the sudden that your screen just went black it is most likely it is the inverter.
If your LCD screen has been geting light and dark or colors have been getting off for a while it is your back light (CCFL).

You can actually have the light replaced but it is a tedious process and it is probably better and cheaper to find a new LCD screen on eBay.

Memory
Sometimes memory modules can do this. If you have extra good memory you can swap out and see if it woks. If you have an extra laptop around that usees the same memory you can put the memory modules in question in the extra laptop and use memtest software to test it.
http://www.memtest86.com/

Cable Connections
I have seen loose cables and improperly seated cables do this as well.
Check the connections at the motherboard and back of lcd screen to make sure they are seated properly.


Conclusion
 
If your onboard video chip has gone bad on your motherboard, you can have it repaired at a reasonable cost compared to having to buy a new motherboard.  This repair will have to be done by a good repair technician and that will be cheaper than a new motherboard.  If your video card is bad then you can replace it.

If your inverter or backlight is bad and you have taken apart a laptop before, you can change the power inverter or LCD screen yourself, but only attempt this if you are sure you can take apart the laptop without breaking anything.

If you can take apart your laptop and check the cables you can save your self some money and time

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