hai provato a verificare le temperature della scheda video con HWinfo? quando ti fa quei beep?
e comunque ti consiglio (se ne sei capace di aprire la scocca e pulire le feritoie del Heatpipe e della ventola)
questo può aiutarti:
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01860375/c01860375.pdf
e segui questi punti, sul manuale: (senza quindi disassemblare l'heatpipe!)
Before removing the heat sink, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on,
and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and then
unplugging the AC adapter from the computer.
4. Remove the battery (see “Battery” on page 4-6).
5. Remove the following components:
a. Hard drive (see “Hard drive” on page 4-14)
b. Optical drive (see “Optical drive” on page 4-9)
c. Switch cover and keyboard (see “Switch cover and keyboard” on page 4-18)
d. Display assembly (see “Display assembly” on page 4-24)
e. Top cover (see “Top cover” on page 4-30)
f. USB board (see “USB board” on page 4-35)
g. System board (see “System board” on page 4-37)
devi fare la ricerca nella guida di questa voce "Fan/heat sink assembly"
[comunque la trovi in: Removal and replacement procedures>Component replacement procedures>Fan/heat sink assembly]
GOOD JOB
Stay Tuned!