The Power LED starts to flash shows that there is a Problem with the NB and as it is yet to be turned on it can not be any thing like a Fan it has to be the Battery not taking a charge or a dead short in the Battery pack. It could have even reversed Polarity and be causing this to happen.
As for a seized Fan you can try placing some oil in the bearing and see if it frees up again but I would suggest buying new Fans and replacing them all. NB's rely on these to keep them alive and when they fail the unit runs hot which does more damage than most people realize. You should also clean out the air ways as well to get rid of any buildup of Dust and other rubbish in the NB. Pay Particular attention to the CPU's Heat Sink here as well.
I would suggest using a Cool Pad like this unit under the NB to help keep things cool and stop the ingress of Dust to block up airways.
http://www.antec.com/us/productDetails.php?ProdID=75004
I refuse to supply any NB without one of these Cool Pads.
As for a Service Manual HP lists these 2 PDF Files as a Service Manual for this NB
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01122313/c01122313.pdf?jumpid=reg_R1002_USEN
and
http://h10025.www1.hp.com/ewfrf/wc/documentSubCategory?rule=13553&lc=en&dlc=en&cc=us&lang=en&product=91451
As possible solutions with the second being the HP Trouble Shooting Q & A.
As for HP Parts look here for a complete list of HP Parts Store for this model NB
http://h20141.www2.hp.com/hpparts/Search_Multi_Product.asp?mscssid=5VN39VQQL52J9JGCM8X35L8N7GBN0H54&SearchCriteria=PAVILION~~XT375
There are 2 Models of this NB one is a F4877H and the other is a F4877HR you?ll need to look at this NB and find out which one it is and then select the correct Model Number above and look for a Part Number which you can check for availability On Kine at the HP Parts Store.
Col
