Tektronix TLA5204B boot error 3 long beeps

[Zigortxu]

Hello,

I have a tektronix TLA5204B, I have not used it in 2 years and now when I connect it, the instrument emits 3 long beeps but no appers nothing in the screen and only work the fans.
It makes the 3 beeps as soon as I press the button, and the button is in red.
Anybody know which is the problem? and how to solve it?

I hope anybody could help me.

Thanks very much

Sorry for my english

Zigor

[RomDump]

CMOS battery is probably dead. Plug in an external monitor.

There is YouTube similar to your problem: https://youtu.be/ir8ijmDURv4

[Zigortxu]

Hello,

Today I have connect a keyboard, a mouse and an external monitor and now works fine. I dont know why but it works well.

Thanks very much

Zigor