Laptop sony vaio pcg-5b1l no enciende

Tal vez esto te ayude.
Knowledge Article C390934
The computer does not turn on or has no power.
Follow this procedure to troubleshoot no power or the computer does not turn on.
IMPORTANT:
? While following this procedure, note the LED status at each step. This will provide
additional information for the technician if repair becomes necessary.
? If model-specific information is required to complete any of the steps in this solution, refer to the operating instructions supplied with the product. Manuals are available online in the Manuals/Specs/Warranty section of the Sony® eSupport Web site.
NOTE: Some computers are designed with hooks above the LCD screen that secure the lid when closed. A switch inside the holes below the touchpad [FIG. 1] detects when the lid is closed and latched. If the switch is stuck, the computer may not turn on properly. Check to make sure the switch is working properly.
1. Connect the AC adapter [FIG. 2] into a known working AC outlet and to the DC jack on the notebook.
NOTES:
? Do not connect the AC adapter to a surge protector or extension cord.
?If the DC jack on the computer is loose or damaged, the computer may require service.
? Some AC adapters have a POWER LED indicator and can be confirmed as receiving
power by ensuring the LED is lit. If the AC adapter is damaged or the LED is not lit when plugged into a working AC outlet, the adapter must be replaced. A replacement AC adapter can be obtained from the Sony® Direct Accessories and Parts Center Web site or by calling (800) 488-7669.
1. 2. Attempt to turn on the computer.
2. 3. Press and hold the Power Switch for 15 seconds.
3. 4. Attempt to turn on the computer.
4. 5. Remove the battery.
5. 6. Disconnect the AC power adapter.
6. 7. Press and hold the Power Switch for 15 seconds.
7. 8. Connect the AC power adapter.
8. 9. Attempt to turn on the computer.
NOTE: If the computer turns on without the battery, connect and charge the battery for 24 hours.
10. Disconnect all external devices that are connected to the computer.
NOTE: These devices include, but are not limited to, a modem, floppy disk drive, network connection, USB device, printer, keyboard, or mouse.
1. 11. Attempt to turn on the computer.
2. 12. Remove any additional Random Access Memory (RAM) that was installed in the computer.
3. 13. Attempt to turn on the computer.
NOTES:
? The troubleshooting steps listed above should resolve your issue. If you have completed all of the steps and the issue is not resolved, service may be required. The Sony® eService Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer.
? When shipping the computer for repair, include all notes of the LED status that displayed during troubleshooting.
Created: Thu Mar 31 12:20 2005 | Last Modified: Mon Mar 10 12:44 2008 http://www.iq.sony.com/srvs/autoresponsev4.asp?id=390934
http://www.iq.sony.com/SRVS/CGI-BIN/WEBCGI.EXE?New,Kb=CISCV3,Compan... 13/05/2008
Sorry si pero la información la encontre en inglés espero no haya inconvenientes

En mi experiencia... hay ocasiones que el BIOS se queda en un estado indeterminado.. no termino de apagar la tarjeta madre pero tampoco está encendido.. no precisamente con VAIO pero te recomiendo lo siguiente que normalmente me funciona en estos casos:

• Desconecta el cargador
• extrae la batería
• espera 1 minuto
• Dale al botón de encendido, para que descargue la carga residual
• Luego, conecta el cargador e intenta encender el equipo
• Si arranca normal, apaga todo, conectas la batería y cargador
• Enciende de nuevo

Si por alguna razón, luego de conectar batería y cargador nuevamente te da problemas, puedes tener algún tema con la batería y podrías trabajar solo con cargador

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Supongo que la prueba de mantener el botón pulsado durante veinte segundos para forzar un apagado completo ya lo habrás hecho…

Otra opción pasa por “calentar” la batería con un cargador con algo más de voltaje, te lo explican en ircshop

A ver si te sirve.

Parece que tu laptop Sony Vaio PCG-5B1L no está recibiendo energía, lo cual podría ser un problema en la placa base o la CPU. Intenta un gorilla tag "hard reset" manteniendo presionado el botón de encendido durante 30 segundos sin batería ni cargador, y luego intenta encenderlo solo con el cargador.