You did take the battery out before cleaning the fan, right?
Probably a connector was not proberly reconnected or was already loose during the re-assmbly.
Just recheck everything.
Here is the HP Service Manual:
http://h10032.www1.hp.com/ctg/Manual/c02...
There are a number of HP EliteBook 2530p disassemble videos on YouTube.
Now to make things clear. Which lights are you referring to?
Lights on left front:
- Wireless light - Blue=on; amber=off
- Power light - Blinking=sleep or standby; On=On; Off=Hibernation or Off
- Battery light - Amber=Battery charging; White=close to full charge; Blinking Amber= battery low with charger unplugged; Off=battery is fully charged when charger is plugged in.
- Drive light - White=drive is being accessed; Amber=drive parked by 3D DriveGuard
Number of Blinking CapsLock/NumLock or Beeps:
https://h30434.www3.hp.com/t5/Notebooks-...
New:
Have you tried resetting the BIOS?
Turn off laptop.
Unplug charger/power supply.
Remove Battery.
Open case and remove CMOS coin battery.
Press and hold power button for 20 seconds.
Put CMOS battery back in.
Plug in powersupply/charger
Press power button. Does it turn on?