just as i inserted the pin it went off and could not boot ever again, only the LED Comes on but no cooling fan

It’s hard to tell what’s going on without looking at the laptop. I hope you didn’t short the motherboard.
Have you tried the following? Unplug AC adapter, remove battery, push on the power button. After that plug in the AC adapter and try turning it on again.

I do have same problem like Danny. K50AB not powering up. After pressing power button, button light up, fun starts and cd-rom blinks but that is all. No keyboard response, tried external monitor. Does not seems to charge battery and on only battery power does nothing at all but battery was ok on last boot up. Tryed removing memory modules with no changes. Disconnecting BIOS battery – no change. What else to try?

Minimize the laptop as much as you can. Remove the battery, DVD drive, hard drive, wireless card, etc… Disconnect the keyboard. In other words, disassemble the laptop to barebone system: motherboard, CPU, memory.
Try turning it on in this basic configuration. If still nothing, this could be motherboard failure. I assume it’s not memory because you tested the laptop with each memory module separately.
Take a look at this tutorial: http://www.laptoprepair101.com/laptop/2008/06/14/laptop-dead-troubleshoot-the-problem/

I got a problem with my asus k50ab. The laptop starts but the screen doesn’t turn on. And the keyboard lights are off. I’ve got a ATI radon hd4570 in. The only thing I can do is turn it off after pressing the off button for a few seconds. Can u please help me put?

This could be memory related failure. Try reseating memory modules one by one. Test the laptop with each memory module separately. If one of them bad, the laptop will start properly with another module.

When power button is pressed, green LED goes on and cooler starts at high speed, as well. Screen flashes with black colour and then remains black.
HDD LED is off, keyboard lights are off (num lock, wifi led, caps lock led).
Nothing happens, cooler continues to rotate at high speed (normally, after 5-10 seconds cooler should go to silent mode and slow speed). External monitor – no picture at all.
No sounds, no evidence of booting. No reaction. The only thing that can be done is power off (by holding power button for 3-5 seconds).

First, I would try removing memory modules one by one. It’s possible that one of the modules failed and the laptop will not start because of that.
Test the laptop with each memory module separately. Try installing them in different slots.

Normally I have two graphic cards – Intel 3200 (embedded) and ATI Radeon HD 4570 (discrete).
I’ve already tried resetting BIOS (removed normal battery and CMOS round battery for about 10-15 minutes).

If one of these cards stopped working, can I somehow switch to another one?

It’s possible that you have a problem with one of the video cards.
I guess the laptop will automatically use the discrete card when it’s installed. Is it easy to remove the discrete card? Maybe the laptop will switch to the embedded video card when the discrete card removed.

You can try barebone approach. Disassemble the laptop as much as you can. Remove battery, DVD drive, hard drive, wireless card, etc… Leave only main parts: motherboard, memory, CPU and probably discrete video card (if you cannot remove it). Disconnect LCD cable from the motherboard (or video card) and test the laptop with an external monitor. Can you get image on the external monitor this way? If not, it’s possible you have faulty motherboard. I hope not.

Good luck!
Удачи!

When power button is pressed, green LED goes on and cooler starts at high speed, as well. Screen flashes with black colour and then remains black.
HDD LED is off, keyboard lights are off (num lock, wifi led, caps lock led).
Nothing happens, cooler continues to rotate at high speed (normally, after 5-10 seconds cooler should go to silent mode and slow speed). External monitor – no picture at all.
No sounds, no evidence of booting. No reaction. The only thing that can be done is power off (by holding power button for 3-5 seconds).

Normally I have two graphic cards – Intel 3200 (embedded) and ATI Radeon HD 4570 (discrete).
I’ve already tried resetting BIOS (removed normal battery and CMOS round battery for about 10-15 minutes).

If one of these cards stopped working, can I somehow switch to another one?

If not, what can be the problem?

Could you please help me with my problem? (the laptop is only 1.5 years in use, but the warranty was only 12 months).

Best regards,
Andrew.

Dell Precision M70 laptop.
During startup (BIOS or initial boot) nothing is visible on the screen unless used with external monitor.
THEN with Linux boot (Ubuntu), laptop screen works perfectly fine as well as the external one. Screen won’t work at all with Windows.
Basically I have to startup using external monitor connected, then the laptop screen is fine once disconnected from external one.

Check the BIOS setup menu.
Maybe the external monitor is set a s a primary screen. This is just a guess.
Do you have “Load Default Settings” option in the BIOS. If you do, try it.