Ccfl screen
all this old are dead or bad. or turn yellow. all do.
all did.
all you can do is turn up the brightness or replace the tubes
CCFL are back lamp tubes. for the SCREEN
CQ58-nnn what, what it the full service tag Partnumber.
ill toss the 50 sided coin and land on cq58-100
the 100 model, is LED and not CCFL lamps
so what OS is running? Windows 7?
i yes, see the users guide on bightness.
read page 26
the magic F3 key.
if the key fails, that means, the drivers loaded on this pc are wrong.
http://h10032.www1.hp.com/ctg/Manual/c03308662
correct drivers are alway here at REAL HP (we are not hp)
im picking w7-64bit now, if not 64bit go back and change that first.
https://support.hp.com/us-en/drivers/selfservice/compaq-presario-cq58-100-notebook-pc-series/5259203
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