black screen + won't turn on without battery

[ruunya]

hi, trying to fix my laptop. it turns on, but i only get a black screen and only 1 blinking light that flashes every few secs. i tryed many things online. reseted the ram, etc. the next thing i wanted to try was to make sure the bio battery is charged, and they say to remove the many battery and plug in the AC and power it on for about an hour. but after removing the battery and plugging it in it won't power on. there is no falt in the cable as it has already charged the main battery. so i'm at a loss for words. any help would be nice

[Lil_Boy_Blue]

Hi

One step at a time...

Can you match the blinking light from here...

Depending on the age of the PC and the BIOS vendor...
https://support.hp.com/us-en/document/bph07107

[ruunya]

it is just single pulse, there doesn't seem to be a pattern. it looks the same as in this video

https://www.youtube.com/watch?v=pw-HLxVpph8&t=412s

[Lil_Boy_Blue]

Hi

Next maybe would be....

https://support.hp.com/us-en/document/c01997899

1. there are no sounds from the computer when the power is turned on, check for a different problem; such as a loose RAM memory chip or disconnected hard drive.
2. If you are having trouble viewing the external monitor, click F4 to switch the screen image among display devices connected to the system. For example, if a monitor is connected to the computer, pressing this key alternates the screen image from computer display to monitor display to simultaneous display on both the computer and the monitor.
3. If an image displays on the external monitor, there may be a graphics driver conflict with the notebook’s LCD display. With the external monitor connected, download and install the latest drivers for your specific computer and graphic chip set.
4. If you do not have an external monitor, it may be possible to see an image by switching the LCD display to a low resolution mode. To change the resolution, turn on the computer, and press the f8 key. If the graphic display is working at the BIOS level, a text screen displays and you can select the Enable low-resolution video option. If the graphics display is not working at the BIOS level, contact an authorized repair center.

As a final action, if there is an image on the external monitor and you have installed the latest BIOS, updated CPU chips set, and updated graphics drivers but the notebook display remains black, the LCD may be defective. It may be necessary to contact HP for technical assistance or send the notebook for service to replace the display.

[ruunya]

i have tried all that. no image from 2 different tv's. pulled out and put back in the ram. and even the smaller battery next to it. hitting the swap screen button did nothing. rebooted with the f8 also did nothing.  

[Lil_Boy_Blue]

Hi

So unless anyone else has any ideas, then it seems like a CPU/GPU or Main Board problem and a service centre is best.

[ruunya]

thanks for your help, i'll see if i can find a repair shop